If using dry sun-dried tomato halves (the type that come in a bag, rather than the oil-packed ones in a jar), pour a cup of very hot water over the tomatoes. Allow them to soften for at least 30 minutes, drain them, and then chop them roughly. If using oil-packed sun-dried tomatoes, you can skip the soaking and simply chop them up.

Place the beans into a food processor fitted with the S blade. Add the tomato paste, garlic, salt, pepper, water or olive oil, and rosemary. Blend for about 30 seconds, or until mostly smooth. Add the sun-dried tomatoes. Pulse a few times to incorporate, then blend for about a minute, stopping if needed to scrape the bowl of the processor down. The mixture should have a few small tomato pieces in it, but it should be mostly smooth. Add an extra tablespoon of oil or water if desired to thin the spread.

Preheat your oven to 400F.