Prepare vegetables: First, remove skin from onion and dice in very small pieces. Mince garlic cloves. Cut mushrooms and carrots into small diced pieces.
Cook onions: In a large sauce pan on medium heat, sauté onions in oil for 2-3 minutes until soft. Stir in minced garlic for last minute.
Add additional veggies: add chopped carrots to cooked onions & garlic. Cook for about 4-5 minutes. Then add chopped mushrooms with pinch of salt and cook for 3-4 additional minutes.
The sauce & lentils: Addpasta sauce and cooked lentils to vegetables. Stir and sit heat on low/warm while you prepare pasta.
Cook the pasta: Bring pot of well salted water to a boil. Cook pasta as instructed or until pasta is al dente and has a "bite" to it. Drain pasta - I usually leave a little bit of pasta water in with the noodles so they don't dry up.
Serve it up: Add a few scoops of sauce to pot with pasta and toss together. Serve with extra lentil bolognese sauce, chopped fresh basil, black pepper, and fresh parmesan if desired.
Notes
How to cook lentils: First, rinse lentils. Boil 3 cups of water with generous pinch of salt. Add 1 cup green lentils to boiling water and stir, reduce to a simmer, and cook for 12-15 minutes. Stir occasionally. Test the texture of the lentils towards the end of your cook time - the texture should have a bite and not be soft/mushy.Generously salt pasta water: whenever making pasta, it's always important to generously salt your pasta water to get the most flavor out of your noodles. I usually eye-ball the amount of salt I use, but you can season with about 1-2 teaspoons of salt (this also depends on how big your pot of water is). Additional pasta noodles you can use: instead of pappardelle you can use tagliatelle, rigatoni, penne, rotini, or fusilli noodles. You can also make it gluten free by using chickpea pasta noodles!