Warm up with this hearty Onion And Fennel Soup Au Gratin recipe. Made with margarine, onions, fennel and onion. Easy step-by-step instructions included.
This Onion And Fennel Soup Au Gratin relies on simple, everyday ingredients such as margarine, `1 1/2 c. chopped onions, chopped fennel and of white pepper. It comes together quickly and makes 4 servings, at about 53 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It works as a light main on its own or as a starter alongside crusty bread, and it's just as good for a cozy night in as it is for feeding a crowd. Leftovers keep well, so it's a smart choice for meal prep too.
Updated Jun 30, 2026