5 Steps to Making Split Pea Soup Step 5, Cooking Pea Mixture You really need to stir quite often as the peas will quickly settle to the bottom. To keep down the foam, a lot at the start, it helps to put butter, (spelled margarine) on the top of the pot. We put in about an 1/4 of a stick for our soup. This will suppress much of the foam. Continue to simmer until the peas are soft. ⇦ Back to Step 4 On to Step 1 ⇨Return to Split Pea Soup |