Equipment
Ingredients
Texture Base
- 100 g walnuts, raw
- 400 g cremini mushrooms, cleaned
- 45 ml extra virgin olive oil
Soffritto & Aromatics
- 1 yellow onion, peeled
- 1 carrot, peeled
- 1 celery
- 4 garlic, peeled
- 2 g fennel seed, crushed
Umami Liquids & Tomato
- 30 g tomato paste
- 15 ml balsamic vinegar
- 15 ml soy sauce
- 5 g marmite
- 800 g crushed canned tomatoes
- 240 ml vegetable broth, warm
Nutrition (per serving)
Method
Place the walnuts in a food processor and pulse until they resemble coarse crumbs. Transfer to a dry large Dutch oven and toast over medium heat for 3 to 5 minutes until fragrant and lightly browned. Remove the walnuts and set aside in a small mixing bowl.
Place the mushrooms in the food processor and pulse until finely minced. Heat the extra virgin olive oil in the same Dutch oven over medium-high heat. Add the minced mushrooms and press them into an even layer. Let them cook undisturbed for 5 minutes to develop a dark crust, then stir and cook for another 5 minutes until their liquid has evaporated entirely.
While the mushrooms cook, finely dice the onion, carrot, and celery. Once the mushrooms are browned, reduce the heat to medium and add the diced vegetables to the pot. Stir well and cook for 8 to 10 minutes until the vegetables soften and become translucent.
Mince the garlic. Add the minced garlic and crushed fennel seed to the vegetable mixture. Stir constantly and cook for 1 minute to release their volatile oils without burning.
Push the vegetables to the edges of the pot to create a bare spot in the center. Add the tomato paste to this spot and cook it directly on the heat for 2 to 3 minutes, stirring it gently until it darkens from bright red to a deep rust color.
Pour the balsamic vinegar and soy sauce into the pot. Use a wooden spoon to vigorously scrape the bottom of the pot, releasing any dark, caramelized bits. Let the liquids bubble and reduce for 1 to 2 minutes until almost completely evaporated.
Stir in the toasted walnuts, Marmite, crushed canned tomatoes, and vegetable broth. Mix thoroughly until the Marmite is completely dissolved and all ingredients are evenly distributed.
Bring the sauce to a gentle bubble, then immediately reduce the heat to low. Partially cover the pot with a lid and simmer gently for 40 to 45 minutes, stirring occasionally. The sauce is ready when it is thick, cohesive, and a layer of seasoned oil floats slightly on top. Adjust seasoning with salt and pepper to taste before serving over fettuccine or linguine.
Chef's Notes
- Pulsing the mushrooms and walnuts in a food processor is crucial; it creates an irregular, nubby texture that is remarkably close to traditional ground meat.
- Marmite and soy sauce are powerful plant-based secret weapons. Their high glutamate content mimics the savory, aged notes of long-simmered beef without adding any meat.
- Searing the mushrooms aggressively is non-negotiable. Mushrooms contain a lot of water; if you stir them too early, they will release their liquid and steam, robbing you of essential roasted umami.
- This sauce benefits tremendously from resting. Like a traditional ragu, it tastes even better the next day as the robust flavors have time to meld and harmonize in the refrigerator.
Storage
Refrigerator: 5 days — Store in an airtight container. Flavors will continue to develop and improve overnight.
Freezer: 3 months — Freeze in individual portions for quick dinners.
Reheating: Reheat gently on the stovetop over medium-low heat until bubbling, adding a splash of water or vegetable broth if the sauce has thickened too much.
