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sauces and thickening agent
Sauces:       
Sauces are liquid or semi liquid mixtures. A keen sense of smell, delicate sense of taste, a light, strong hand for the blending- all contribute to a perfect sauce. It provides moisture, colour & shine to food.

Importance of sauces in food preparation: 
1.      Enhances flavours.
2.      Some sauces help in digestion e.g. mint sauce.
3.      It gives moistness to the food e.g. white sauce.
4.      Adds colour to the food e.g. tomato sauce.
5.      Served as an accompaniment e.g. cranberry sauce with roast turkey.
6.      Enhances nutritional value of the dish.
7.      Dresses and compliments food.
8.      Gives tartness and contrast or balances bland food.
9.      The holding temperature for warm emulsion sauce is 30 to 37deg C .
10.  A liaison thickens at 80 to 88 degree C.
11.  4 L of sauce yield 80 portions.
12.  The service temperature of hot sauce is 85 degree C.

Types of sauces:
Basically there are two types of sauces
1: proprietary sauces
2: contemporary sauces

Proprietary sauces: these sauces are made in factories ,there recipes are hidden that is why they maintain same qualities in terms of flavour aroma colour and consistency.
Examples are- Worcestershire sauce, HP sauce tabaseo sauce.

Contemporary sauce:  contemporary sauces are those sauces  can be made in the kitchen ,there recipes are not hidden that is why there taste colour consistency may vary a bit. There are three types of contemporary sauces-
1- mother sauces or basic sauces.
2- butter sauces
3- A class of there own

Mother sauces: these are the main basic sauces , from which all the other sauces are derived addition of various ingredient to these basic sauces creates an array of sauces which accompany various dishes, giving them there identity.
The following are the basic six mother sauces:

1- béchamel or white sauce- béchamel sauce is named after Louis de  béchamel, it is prepared with white roux and mildely flavoured with onion.

2- veloute sauce: it is a basic blond sauce. It is prepared from blond (light brown) roux and stock. Veloute gets its name type of stock used
 for example: fish stock and blond roux will make fish veloute , Chicken stock and blond roux will make chicken veloute.

3-  Brown or Espagnole sauce:  brown sauces made from brown roux and brown stock or glaze of brown stock. It is one of the most widely use basic or mother sauces.
Demi glaze is derivative of brown sauce it is prepared by mixing  1 litre of brown sauce and 1 litre of brown stock reduced to half (1 litre)

4- hollandaise sauce(dutch sauce): it is warm yellow and rich sauce it contain a high percentage of fat and egg yolk .it is an emulsion of butter lemon juice and egg yolk.

NOTE : If hollandaise turns or curdles or is too thick , beat in a little hot water , a little at a  time. If too thin , add a tea spoon of lemon juice to a table spoon of the sauce in a warm bowl and whisk until it is thick . then add the remaining mixture at a a time, whisking all the time. If this method does not rectified the same , then in a clean bowl add egg yolk, a few drops of hot vinegar and whisk while adding the curdled hollandaise.

5: tomato sauce: it is red kitchen sauce and has some piquancy . tomato sauce is more commonly associated with Italian cusine.

6. mayonnaise:  it is basic cold sauce ,it is used as a salad dressing and as an accompaniment it has a wide variety of uses ,it is a rich sauce as it is thickend with egg yolk and has a high percentage of fat.

NOTE:  If mayonnaise sauce turns or curdles
,1. take a clean bowl, add boiling water or vinegar and gradually whisk in the curdled sauce.
2. place an egg yolk and gradually whisk in the curdled sauce.
3. if a small quatity of mayonnaise is to be rectified , then put mustard powder in a clean bowl and add in, drop by drop, whisking the curdled mayonnaise.

Butter sauces: they are serve  melted in liquid form or has hard butter sauces. Butter is mixed with different ingredient, set and cut in fancy shapes and served with food items the other name for butter sauces is compound butter.

A class of their own: these sauces are have an individuality of their own in terms of colour, flavour. Consistency and style of preparation. they blend with food items ,they accompany or give them a contrasting sharpness . various types of sauces are
Apple sauce, Mint sauce, Cranberry sauce.

Derivatives:
basic
sauce
white
brown
tomato
mayonnaise
hollandaise
fish veloute
chicken veloue
meat veloute
color
white
brown
red
light yellow
yellow
blond
blond
blond
1
cheese
chasseur
barbecue
tartare
maltaise
shrim
caper
Chivry
2
cream
robert
provencale
cocktail
foyot
vin
berci
Ivory
3
parsley
diable
portugaise
vincent
choron
diplomat
aurore
Supreme
4
mustard
demi glaze
italienne
verte
bearnaise
normande
curry
ravigote


Thickening agent:

1:  beurre manie( manie butter) – equal quantity of refined flour and butter are kneaded together and very little quantity is added at a time to the boiling liquid and stirred well to form a smooth consistency.

2: roux-  equal quantity of refined flour and butter cooked together it is cooked to various degree , mainly white blond or brown. While preparinf the sauce, boiling liquid should never be added to a hot roux as it may render it lumpy a cold liquid to a hot roux or a hot liquid to a cold roux result in smooth texture.

3- startch- arrowroot, corn flour , fecule( potato flour) , tapioca are used to thicken the sauce. A paste should be made of cold liquid and startch and when stirred into boiling liquid and allowed to boil till the startch is cooked. A slurry is a  liquid or semi liquid  mixture of startch and cold liquid.

4:  liaison- yolks of eggs and cream mixture  is called liaison. It is added as a finishing agent at the end of cooking . the product is never boiled after the liaison has been added else it would curdled.


5: blood- it is usually used for game cooking . it thickend the sauce and gives a particular flavour .

stocks and glazes

Stock:
It is a liquid in which meat or meat bones, fish or fish bones and various vegetables have been cooked to extract flavour.
Fonds de cuisine is a kitchen stock.

Stocks are nutritious, aromatic, strongly-flavoured liquids. They are important foundation liquids that are used in the preparation of various dishes such as soups, sauces. Gravies, stews, curries, braising, rice and cold dishes.
Care and precautions:
The preparation of stocks calls for understanding, care and discerning taste. Long , slow simmering of food and cold water used for stock (except for fish stock) is required to draw out the flavour and nutrients into the liquids.

As stock is an important ingredient in various dishes, care should be taken in its preparation as follows:
(a) All fat should be removed from the outset as the stock becomes very greasy as well           as rancid soon.
(b) Marrow must be removed and put aside for use as a separate dish (marrow toast) or as a garnish (petite marmite, i.e. a soup).
(c) Stock should only simmer. If allowed to boil, the agitation and particles of fat cause an emulsification and it becomes milky or cloudy.
(d) Bouquet garni should be tied to a handle of the stock pot. Large cur pieces of vegetable should be added later on as it flavours the stock.
(e) The scum should be discarded.
(f) For storing, the stock should be strained and the liquid should be cooled. No fat should be allowed to remain on the surface as it prevents heat from escaping and may cause the stock to turn, i.e. become sour.
(g) Stock could be stored in a refrigerator or cold room.
(h) Stocks turn cloudy if boiled too rapidly and if a lid is used  and not carefully strained and not skimmed properly.

 Different kinds of stocks are:
White stock                                                                              Brown stock
White beef stock                                                     Brown beef stock (estouffade)
White mutton stock                                               Brown mutton stock
White veal stock                                                     Brown veal stock
White chicken stock                                               Brown game stock
Fish stock

 Glazes:
Glazes in classical cookery are used for enhancing the flavour of sauces, enriching sauted meats & for decorating finished hot or cold dishes. It gives a brilliant and unctuous coating to dishes and improves their appearance. The common glazes are meat, chicken & fish glazes.
Meat Glaze- Brown stock is put in a large stew pan on an open fire and reduced, skimming the scum that comes up. As the volume reduces, smaller stew pan should be used and heat lowered. It should be strained through a muslin cloth.
Chicken Glaze- Chicken stock is used and prepared the same way as meat glaze.
Fish Glaze- Fish fumet is prepared the same way as meat glaze but it is less concentrated and its flavour is more delicate than that of meat glaze.

Storage- The correct storage temperature for stocks is 1 degree C to 4 degree C.


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