Explain how fats are involved in the leavening of each of the following products: puff pastry; cake made with high-ratio plastic shortening; cake made with high-ratio liquid shortening. You have two...

Explain how fats are involved in the leavening of each of the following products: puff pastry; cake made with high-ratio plastic shortening; cake made with high-ratio liquid shortening.

You have two sunfl ower oils with very different fatty acid profi les. One has 69 percent polyunsaturated fatty acids; the other has 9 percent. Which will oxidize and taste rancid sooner, and why?