Mushroom spaghetti

250 g spaghetti
250 g (?) mushrooms

1 onion

few dried porcini

75 g walnuts
1 teaspoon cumin seed

2 teaspoons marmite

lemon

fresh dill

Soak the dried mushrooms in half a cup of hot water. A handful at a time, blitz the mushrooms in the food processor. Ditto the onion. Cook them in a saute pan over medium high heat until they dry out and begin to brown. Grind the walnuts with cumin seeds and add them to the mix. Dissolve the marmite in the mushroom water and add it to the mixture. Season with lemon and salt and pepper. Add chopped herbs. Cook some spaghetti and use the pasta cooking water to loosen the sauce.