Butternut Squash Lasagna

1.5 lbs. ground beef;

1 large butternut squash, peeled and cut into thin slices;

4 cups tomato sauce;

4 oz. tomato paste;

1 onion, minced;

3 garlic cloves, minced;

1 tsp. dried basil;

1 tsp. dried oregano;

Cooking fat;

Sea salt and freshly ground black pepper;