Rinse the mushrooms well and cut them in half. Add to the bowl of a large food processor and using the Pulse button chop them up into tiny pieces.
1.5 lb brown button mushrooms
Preheat a large heavy bottom dutch oven or stock pot over medium heat. Add a drizzle of olive oil and sauté the onion, celery and garlic with a pinch of salt and chili flakes until softened and the veggies start to get a little golden color around the edges. Push the veggies to the side and drizzle a tiny bit of olive oil in the center then add the garlic. Cook until fragrant, about 35 seconds or so, don’t let it burn.
1 medium yellow or white onion, 1 celery stalk, 1 large carrot, 4 garlic cloves, 1/2 tsp red pepper flakes
Stir in the tomato paste then add the mushrooms and turn up the heat. Continue cooking on high as they will release a lot of water and we want that to evaporate. Once most of moisture has evaporated add the lentils and stir well.
1.5 lb brown button mushrooms, 1 Tbsp tomato paste, 1.25 cups black lentils
Pour in the wine and bring to a boil. Continue cooking until the wine has reduced by half. Add the bay and rosemary (+ porcini powder & kombu if using).
1 cup red wine, 2 bay leaves, 1 sprig rosemary, 1 tsp porcini mushroom powder, 3x3 inch piece kombu seaweed
Transfer the tomatoes to a large bowl and using your hand crush them but keep a few larger pieces throughout for texture. Add the tomatoes with all the juices to the pot with the lentils. Pour in the water, stir well and bring to a constant simmer on medium heat.
2 x 28 oz canned San Marzano tomatoes, 1.75 cups water
Partially cover with a lid and cook the sauce for 1 hour or until the lentils have cooked through and the sauce is reduced into a nice and thick ragu. Stir often making sure nothing sticks to the bottom and the tomato sugars don’t burn. Season with the sea salt and nutritional yeast half way. (TIP: If the lentils are absorbing more liquid than you’d like, you can add more water by 1/4 cup as needed).
1.5 tsp fine sea salt, 3 Tbsp nutritional yeast
Once the sauce is done to your liking stir in the parsley and finish with a grating of nutmeg. Adjust seasonings to taste with salt and pepper.
1/3 cup flat leaf Italian parsley, 1 pinch freshly grated nutmeg
Toss with gnocchi or wide noodles and serve with extra parsley and chili flakes on top. (The sauce is best the second day after the flavors have had a chance to marry overnight. Only combine with as much pasta as you plan on eating right away and remember to discard the bay, rosemary sprig and kombu if using).
Pasta for serving: gnocchi or a flat noodle like pappardelle, fettuccine or tagliatelle.