Leche flan, though only has a few ingredients, requires quite a few tricks to be good leche flan. Straining the egg mixture with cheesecloth is an important step. This process removes the foams that may create bubbles when flan is cooked. Soft cotton cloth will work just as well. Lineras can be bought in any Asian supermarket. If unavailable a cake pan or any small-sized aluminum pans will do.