MADE FROM mashed potatoes and cream-puff pastry, pommes de terre dauphine are potato puffs that are fried just before serving. They are good served with roasted meats like beef, lamb, chicken, and turkey. The batter can be prepared up to a day in advance to make their preparation easier. It is important to dry the mashed potatoes to extract any excess moisture. If the potatoes are too wet, the puffs will be heavy instead of light. For the same reason, make sure any ingredients mixed with the batter (see Variations) are also dry.