Savory Squash Tart

Ingredients

• 1 1/2 C AP flour plus more for rolling out dough
• 4 ounces ice cold butter, cubed
• 1 tsp Kosher salt
• 1/4 C Ice water
• 1 Egg yolk for egg wash
• 1 Tbsp butter plus 1 T olive oil
• 1 Medium butternut squash or similar squash like Red Kuri
• 1 1/2 Large onion, sliced
• 6 Cloves garlic, minced
• 2 tsp Finely chopped thyme
• 4 Ounces crème fraîche
• 1/2 Cup walnuts, chopped
• Salt and pepper to taste
• 4 ounces butter
• 2-3 counces comté cheese