Hachis Parmentier Mashed Potato Casserole

Ingredients

• 2 onions, chopped
• 3 garlic cloves, minced (or pressed)
• 1 tablespoon butter
• 2 tablespoons olive oil
• 3 tomatoes, chopped
• 1 1⁄2 lbs lean ground beef
• 1 tablespoon herbes de provence (or other herbs to your taste)
• salt & pepper, to taste
• 1 egg yolk
• 2 tablespoons parmesan cheese
• 4 -5 cups mashed potatoes (instant is fine)
• 3⁄4 cup gruyere cheese, grated (can also use emmental or similar)

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