Heat a large dutch oven or pot and add the cooking fat. Cook the ground beef and bacon for about 5 minutes. Remove the meat with a slotted spoon and set aside.
1 lb ground beef, 2 tablespoon cooking fat, ¼ cup chopped bacon
Use the same dutch oven or pot to cook the other ingredients (carrots, celery, onion, garlic and oregano). Cook over medium heat until soft.
1 large onion, 3 cloves garlic, 3 carrots, 2 celery sticks, 2 teaspoon dried oregano
Add the tomatoes, tomato paste, ground beef, bacon and bay leaf.
2 tablespoon tomato paste, 1 bay leaf, 20 plum tomatoes
Season with salt and pepper to taste. You can also add some chili or hot pepper flakes for more heat.
Sea salt and freshly ground black pepper
Bring to a boil and then reduce to a simmer and simmer for about 45 minutes.
In the mean time, heat your oven to 350°F.
Cut your spaghetti squash in half length-wise, remove and discard the seeds.
4 medium spaghetti squash
Place the halves cut side down on a baking sheet and put in the oven for about 28 to 35 minutes. Check on them at around 25 minutes. Poke with a fork, the flesh should easily break into strands to form “spaghetti.” Make sure not to overcook, because they will become too mushy.
You can now pour a generous amount of the sauce directly on the squash halves so that it forms its own bowl or you can break the squash in strands yourself and serve on a plate with the sauce.