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Caramelized Onion and Tomato Tart Au Gratin

Teresa
  • 45 minutes
  • Serves 8

INGREDIENTS

1/2 tsp

Basil

1/2 tsp

Oregano

1/2 tsp

Rosemary

1/2 tsp

Sage, leaves

1/2 tsp

Thyme

3

Tomatoes, large

1/4 tsp

Pepper

1/2 tsp

Sea salt

2 tbsp

Olive oil

3 tbsp

White wine vinegar

1/2 cup

Asiago cheese

1/2 cup

Fontina cheese

1/2 cup

Parmesan cheese

1/4 cup

Pecorino romano cheese

1

Extra large onion (sliced and separated into rings, about 1-lb. or two large onions)