A lot of friends think this is great.
Source: family recipe
San Marzano tomatoes, 6-7 cloves of garlic, kalamata olives (chopped lightly), can of anchovies, capers (chopped), parsley.
Start with lightly sauteed garlic (just fragrant, not browned), then add tomatoes and all other ingredients (except parsley) and a few pads of butter. When reduced to thick enough that you can see the bottom of the pan when scraping, add chopped parsley. Garnish with some extra parsley and parmesan cheese.