In large bowl, combine eggs and oil, beat slightly. Gradually beat in milk, flour and salt. Pour batter into 10 well-oiled custard cups. Place cups on baking sheet. Bake in moderate oven 1 hour (375 deg), or until firm and brown. If desired, remove popovers from oven after 45 minutes, cut slit in side of each to let out steam, and return for last 15 minutes. Makes 10 large popovers. ----