Vegan Galette with Caramelized Onion and Vegetables

Ingredients (for 16 servings)

• 1 cup — Cauliflower
• 1 cup — Winter Squash
• 1 cup — Shiitake Mushrooms
• 4 whole — Thyme
• 2 whole — Onions
• ¾ cup — wheat flour
• 1 pinch — sea salt
• 1½ tbsp — tahini
• 1 tsp — apple cider vinegar