This is a recipe I found for the Salsa Negra (or Salsa Baja) from Baja Fresh. The trick behind the flavor (and color) in this recipe is the heavily roasted tomatoes.
Here are the ingredients for the recipe:
10 large tomatoes for grilling/broiling
2 jalapenos (adjust amount for heat)
1 tbsp lemon juice
1/2 large onion - coarsely chopped
1 tbsp garlic - chopped
1 can clear chicken/vegetable broth
1/4 cup olive oil
1/2 cup cilantro - chopped
2-3 fresh tomatoes - diced
Salt to taste
Step 1: Prepare the tomatoes
Set your oven to Broil - High.
Cover a cookie sheet with aluminum foil, and coat with a non-stick cooking spray.
Cut tomatoes in half and place, cut side up, on cookie sheet.
Sprinkle with salt
Place the tomatoes in the oven and leave them to broil for 45 minutes to an hour (depending on your oven.