Preheat the oven to 450°F. Line a baking sheet with aluminum foil.
In a large bowl, add the tomatoes, onions, habañeros, garlic cloves, and olive oil. Toss together gently to coat, then spread the coated vegetables out onto the prepared, lined baking sheet.
Roast at 450°F for 20-25 minutes, until the vegetables have a slight char on them. If the vegetables are not as charred as you would like, you can then switch the oven to broil and broil for 3-4 minutes.
Add the roasted vegetables, mango, cilantro, salt, and lime juice to a food processor (or high powered blender).
Process on low to start, then increase speed to high and process until the salsa reaches your desired level of chunkiness.
Pour the salsa into a bowl and cover, then chill in the refrigerator for at least 2 hours before serving.
Notes
Makes approximately 2 cups, or 12-16 servings.Storage: store salsa in an airtight container, such as a mason jar, in the refrigerator for up to one week.