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Caramelized Onion, Kale and Feta Frittata

warmvanillasugar.com
  • 70 minutes
  • Serves 4 to 6

INGREDIENTS

2 tbsp

extra virgin olive oil

3

onions, finely sliced

1 tbsp

red wine vinegar

1 tsp

granulated sugar

1 tsp

Worcester sauce*

1/4 tsp

dried thyme

salt and pepper, to taste

2

garlic cloves, minced

2

big handfuls (3-4 cups) chopped kale, ribs removed

6

large eggs

1/4 cup

plus 2 tbsp milk

1/3 cup

crumbled feta cheese

Hot sauce, for serving (optional)