Step 1

In a medium skillet, heat the olive oil. Stir in half of the diced plum tomatoes and add the shallot, crushed chipotles and a generous pinch of salt and cook over moderate heat, stirring occasionally, until the chiles are softened, about 5 minutes. Scrape the mixture into a large bowl and let cool completely.

Step 2

Add the avocados, onion, serrano chile, lime juice and the remaining diced tomato to the bowl and stir gently. Gently fold in the diced mango and the 1 cup of chopped cilantro and season with salt. Garnish the guacamole with cilantro leaves and serve with tortilla chips.