PREHEAT oven to 350°F
MIX mix all the ingredients for the pie crust until they come together to form a ball
PRESS by hand across the bottom and up the sides of a 10” tart dish or pie plate. Press around top edge of crust with a fork
BAKE crust at 350°F for 10 minutes
SAUTÉE both types of onions with 2 Tbsp olive oil until soft and caramelized
SPREAD cooked onions over baked pie crust
WHISK eggs with sea salt and pepper and pour into pie crust over cooked onions
GARNISH with chopped fresh or dried herbs, grape tomatoes and cheese
BAKE for 18-20 min, then low broil for a minute or so to brown (watch closely so it doesn't burn!)