It's a bit involved, but I think it's worth it. You also end up with a lot of sauce that can be frozen. I don't think that it tastes like meaty Bolognaise sauce - but it hits the same spot.   Sauce for 800-900g pasta (dry weight). I really suggest a hearty pasta shape, preferably fresh.   2-3 tbsp butter, or oil if vegan 120 g (lightly) toasted walnuts soaked and washed, then chopped quite finely 2 medium carrots, very finely chopped (250g) 1 medium onion,