Zucchini and Caramelized Onion Galette with Gruyere

INGREDIENTS

1 1/4 cups

White Whole Wheat Flour *See Note (6 3/4 oz)

1 1/4 cups

All Purpose Flour (6 1/4 oz)

1/2 tsp

Sea Salt

, 8 oz Sticks of Butter (cold)

1/2 cup

Milk

1 tbsp

Apple Cider Vinegar

2 tbsp

Water (ice cold)

lbs Sweet Onions ((about 4 smallish ))

lbs Zucchini ((about 6 small))

1 cup

Gruyere (grated (8 oz))

1 tbsp

Olive Oil

1 tbsp

Butter

2 tsp

Sea Salt (divided)

1 tsp

Granulated Sugar

1/4 tsp

Ground Pepper

1/8 tsp

Red Pepper Flake (dried, optional)

1/4 tsp

Tarragon (dried)

1/4 tsp

Thyme (dried)

Sprigs Thyme (fresh for garnish)

1 tbsp

Egg + 1 Water