You can use any kind of broth and the taste will not change.
yes
Yes you can, I use whatever flour I have to hand.
no
yes
Instead of using oil you can use butter this works just as well as oil sometimes even better .One bad thing is butter can be worse for your health then oil .Also there are oil sustitutes made out there.
Yes
Palm Oil Sandwich Palm Oil Pie Palm Oil Pasty Palm Oil Casserole
Yes you can use 5W20 oil instead of 5W30. One is just thicker then the other. The 5W20 is better in the winter and the 5W30 is better in the summer.
Yes, I always do.
Yes, you can.
For cooking steaks, it is better to use butter than any oil.
A large casserole will allow you to pot-roast large pieces of meat without jointing them first. A large casserole is necessary for slow-braised lamb-shanks, for example. Or you could feed a heap of people.