i am not an expert but i think people usually do this to make the sauce thicker =)
Because when you are cooking sauce it's thicker then water so it takes longer to heat.
no bean paste is thicker than bean sauce eg. bean paste goes on the bottom of a pizza and bean sauce would go on top.
Yes, it is a good idea as this has a lot of flavour in to. You can boil the sauce to evaporate the excess liquid and make the sauce thicker and more concentrated.
The reason you have to stir the white sauce continually is so it doesn't get lumps through it and so it gets thicker :)
no, they use a teaspoon of animal lard in the sauce to make it thicker
The basic ingredients are the same. In fact, any tomato sauce recipe can be used as a spaghetti or pasta sauce or as a pizza sauce. However, pizza sauce should have a thicker consistency than most spaghetti sauces. Watery sauces will soak the crust and leave you with a soggy pizza. If leftover or store bought spaghetti sauce is going to be used on pizza, as is with no 'doctoring', reduce the sauce by simmering in a sauce pan until it has the consistency of a thick pancake batter.
Try evaporated milk as a substitute for light cream. It's slightly thicker than regular milk so the texture of the sauce will be similar, and it comes in 2% or fat free. The color of the sauce will be slightly darker because of the color of the milk, but if that is not an issue the sauce should come out well in appearance and flavor.
Bucatini is a pasta that can be used in the same recipes you'd use to make spaghetti. It's just a thicker form of spaghetti. It is excellent with meat sauce.
There are basically two reasons for boiling (simmering) homemade pasta sauce for an hour. The longer the sauce cooks, the thicker it will be. Also, simmering for longer periods of time will allow the flavors to "marry," creating a better tasting sauce. Many recipes specify simmering pasta sauces for even longer; two hours or more.
You can boil down tomato sauce on the stove. You can also blend crushed or whole tomatoes and boil down to 2/3s the sauce.
The difference between a fruit sauce and a fruit puree is that a fruit puree is fruit that has been pureed so you are left with the juice and pulp of the fruit. A fruit sauce is fruit with other ingredients used to make the sauce.