Bring a large pot of salted water to a boil and cook the spaghetti according to package directions. Drain and set aside.
Finely chop the onion, garlic, carrots, and celery stalks.
Heat olive oil in a large skillet over medium heat. Sauté the onion and garlic until fragrant, about 3-5 minutes.
Add the carrots and celery stalks and cook for 5-7 minutes, or until slightly softened.
Stir in the diced tomatoes, tomato paste, cooked lentils, basil, oregano, salt, and pepper. Bring to a simmer, then reduce heat and cook for 15-20 minutes.
Taste the sauce and adjust seasonings as needed. If the sauce is too thick, add a little water to thin it out.
Serve the spaghetti with the lentil Bolognese sauce. Garnish with freshly chopped parsley and vegan Parmesan cheese, if desired.
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