Here's a walnut sauce that I make to serve with steamed or grilled broccoli. You could use it to serve with all sorts of vegetables.
Put a generous handful of walnut kernels into a food processor with a couple of cloves of garlic, a chilli (optional) a few anchovies (optional), a tsp of salt and 1 tbsp of vinegar or lemon juice. Process until the walnuts are finely chopped (you might need to scrape the sides of bowl a few times). Then, with the machine running, very slowly stream in ice cold water until you get a thick emulsified, creamy sauce. Stop adding water when the sauce is the consistency of thick cream.
