Ingredients
Method
- Preheat oven to 350 degrees. Slice potatoes and onion thinly.
- Melt margarine and rosemary in a saucepan until lightly browned, then remove from heat.
- Whisk egg yolks with lemon juice and mustard in a bowl.
- Remove rosemary from margarine, then slowly pour margarine into egg yolk mixture while whisking.
- Saute onions, brown sugar, salt, and pepper in the same pan until fragrant and soft.
- Bring vegetable stock to a low boil, add egg mixture while mixing. Whisk in flour and cook until thickened.
- Pour a small amount of sauce into the baking dish. Layer potatoes, onion mixture, and sauce, repeating three times.
- Add a fourth layer of potatoes and top with remaining sauce.
- Bake covered with foil for 35 minutes, then uncovered for 35 minutes. Broil for 5-7 minutes until golden brown.
Notes
For a richer flavor, consider using chicken stock instead of vegetable stock.
