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Preheat oven to 400 degrees. Line a baking sheet with aluminum foil and drizzle 1 tablespoon of olive oil over both halves of spaghetti squash. Bake for about 45 minutes.
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Meanwhile in large skillet, heat remaining tablespoon of olive oil over medium-high heat. Add onion, celery and carrot and cook, stirring occasionally, until vegetables are soft, about 8 minutes. Add garlic and mushrooms and continue to cook for another 1-2 minutes.
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Stir in crushed tomatoes, broth, lentils, sugar, bay leaf, oregano, chopped basil, salt and pepper. Bring to a boil, then reduce heat to medium-low and simmer until lentils are tender, about 30-40 minutes, stirring occasionally. If sauce becomes too thick, add more broth or water. Discard bay leaf.
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When spaghetti squash is tender, remove from heat and let cool slightly. Use a fork to gently pull the squash flesh from the peel and to separate the flesh into strands. Toss in a large bowl with 1 clove grated garlic and season with salt. Spoon ragu over spaghetti squash.