1 tablespoon extra-virgin olive oil
2 plum tomatoes, cut into 1/4-inch dice
1 shallot, finely chopped
2 dried chipotle chiles, stems discarded and chiles finely crushed
Kosher salt
2 Hass avocados—halved, pitted and diced
1/2 cup finely chopped white onion
1 serrano chile, minced
3 tablespoons fresh lime juice
1/2 mango, cut into 1/4-inch dice (1/2 cup)
1 cup lightly packed cilantro, finely chopped, plus whole leaves, for garnish
Tortilla chips, for serving