Warm up with this hearty Simple and Easy Onion Gratin Soup recipe. Made with Onion, Olive oil, Water and cube. Easy step-by-step instructions included.
This Simple and Easy Onion Gratin Soup relies on simple, everyday ingredients such as onion (sliced), olive oil, water and consomme soup stock cube. It comes together quickly and makes 4 servings, at about 162 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