Pomelo is the Vietnamese grapefruit that looks like a grapefruit on steroids. When it’s ripe, it can be very sweet, a perfect complement for sweet pineapple. The Vietnamese like to salt (and sometimes add chili to) their sweet tropical fruits. Pineapple and pomelo are no different. A little bit of heat from the chili powder and the right amount of salt make for a popular and refreshing snack.