Cut them in half length wise and roast them in the oven at 400 for like 30-45 minutes, until they've shrunk about half but haven't dried up. Transfer to a pot, add a diced onion, some olive oil and fresh chopped tarragon. Sweat the onions, then puree with a stick blender and add a shot of vodka. Season w/ salt and pepper, simmer for maybe 10-15 mins, then add a little bit of heavy cream or half and half, stir, and pull off the heat. Serve over pasta.
That's what I'm about to do with some overripe roma tomatoes I have here.