Prepare the vegetables: Finely chop the mushrooms and walnuts. Fo ease, I used a food processor. Pulse the mushrooms and walnuts in a food processor a few times until they resemble small crumbles. Avoid overprocessing.
8 oz cremini mushrooms, 3/4 cup raw walnuts
Sauté the aromatics: Heat olive oil in a large skillet over medium heat. Add the diced onion and cook for 3–4 minutes until softened. Stir in the garlic and cook for another 30 seconds.
1 tbsp olive oil, 1 small yellow onion, 3 garlic cloves
Cook the mushrooms and walnuts: Add the chopped mushrooms and walnuts and cook for 5–7 minutes, stirring occasionally, until most of their moisture has evaporated and they begin to brown.
Build the flavor: Stir in the tomato paste, oregano, basil, smoked paprika, salt and pepper and red pepper flakes. Cook for 1–2 minutes to deepen the flavor of the tomato paste.
2 tbsp tomato paste, 1 tsp dried oregano, 1 tsp dried basil, 1/2 tsp smoked paprika, 1/4 tsp red pepper flakes, 3/4 tsp salt, black pepper to taste
Simmer the sauce: Add the drained lentils, crushed tomatoes, water, and soy sauce. Stir well and bring to a gentle simmer. Reduce the heat and cook covered for 10–15 minutes, stirring occasionally, until thickened.*At this time start to cook the pasta to package instructions. Cook in salted water for more flavor. 15 oz can of crushed tomatoes, 1/2 cup water, 15 oz can of lentils, 1 tbsp soy sauce
Finish: Stir in the balsamic vinegar and maple syrup. Taste and adjust with salt, black pepper, or additional herbs. For a thicker texture, gently mash some of the lentils with the back of a spoon.
2 tsp balsamic vinegar, 1 tsp maple syrup
Serve: Toss the bolognese with cooked pasta, adding a splash of reserved pasta water if needed. Top with fresh herbs.