1. Preheat grill to medium. Brush grill grate with oil.
2. Grill tomatoes, onion, garlic packet, and jalapeno , covered, until tomatoes
begin to char, about 5 minutes. Flip and grill 5 minutes more.
3. Remove vegetables from the grill. When vegetables are cool enough to handle , peel skin from tomatoes, chop onion and jalapeno, and peel skin from garlic.
4. Pulse chopped vegetables, cilantro, lime juice, salt and sugar in a food processor until salsa is chunky.
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