There is no one definite recipe for Or Lam because there are no fixed rules about how to make it. Some people put in a very large quantity of fresh vegetables and mushrooms, until the dish is more like an Or Phak (a vegetable Or). In fact, there are two types of Or Lam. One is called Or Ro: and this is made by putting in meat or fish and vegetables and mushrooms - everything edible - in large or small quantities. That is why they call it Or Ro. ('Ro' in Lao means to put in. So 'Or Ro' is the result of putting in whatever you have.) The real Or Lam is the one I have explained above. The tastes and smells of the two types of Or Lam are different.