1In small bowl, mix chutney mayo ingredients. Cover; refrigerate until serving time.
2In 8-inch skillet, heat oil over medium heat. Cook onion and chile in oil 3 to 5 minutes, stirring occasionally, until tender. Add curry powder, cumin, ginger, salt and pepper; cook and stir 2 minutes longer.
3Heat gas or charcoal grill. In large bowl, mix beef and onion mixture. Shape mixture into 4 patties, 1/4 inch thick. Place patties on grill over medium heat. Cover grill; cook 5 to 8 minutes, turning once, until meat thermometer inserted in center of patties reads 160°F. During last 2 minutes of cooking, place rolls, cut sides down, on grill until toasted.
4Spread chutney mayo on cut sides of rolls. Place burgers on bottom halves; top with lettuce and tomato. Cover with top halves of rolls.