Grilled Guacamole

Name: Grilled Guacamole
Ingredients: 1 -2 medium fresh poblano chili peppers; 1 medium vidalia onion, peeled, sliced crosswise, ½-inch thick; 1 jalapeño pepper, optional; 2 tablespoons canola oil, divided; 4 ripe Hass avocados; 3 tablespoons lime juice (juice of three small limes); 1 teaspoon kosher salt, or more to taste; 3/4 teaspoon ground cumin; 1 cup grape tomatoes, quartered (we used tri-color); 2 tablespoons fresh cilantro, finely chopped