After shelling, a pound of fresh peas yields about 1 cup. Preparing fresh peas can take quite a while, and may be more labor-intensive than you had in mind. Depending on location and time of year, it may be more cost-effective to use frozen peas, and they'll contain most of the same nutrients.
½ cup fresh or frozen peas
2 tablespoons water
Put the peas into a steamer basket, or place into a saucepan covered by 1 inch of water. Steam the peas until tender, about 10–12 minutes.
Drain the peas and place into a food processor or blender. Purée to a chunky consistency.
Add leftover water from steaming, using 1 tablespoon at a time. Otherwise, add water, breastmilk, or formula.
Continue puréeing until smooth.
Freshly puréed vegetables will keep in the refrigerator for 2–3 days. Store them in a tightly sealed container, and always serve your baby from a separate bowl. Peas may thicken after refrigeration, so add a bit of water or formula, and stir well before serving.