Chop the mushrooms with the food processor. Not too long, it shouldn`t be muddy, but rather have a minced meat consistency.
To ferment, put the chopped mushrooms in the oven at 50 degrees Celsius. If you don`t have a convection oven, simply clip a wooden spoon into the oven door. The mushrooms are good when they`re dark in color and most of the moisture is out. In my oven this takes 30-35 minutes.
At the same time, cut the tomatoes into small pieces and put them in the food processor together with the tomato paste, salt and pepper, the agave syrup (or sugar) and process into a sauce.
Put on the pasta water and cook the pasta according to the instructions.