Bo la lot is a fat bomb hiding behind a leaf. The mince is beef mixed with pork fat or pork mince, usually 20 to 30 percent fat, because lean beef dries out on the grill. So a 40g roll is about 90 to 110 calories, and the published range for a 50 to 60g roll is 120 to 180. Five rolls on a plate is 440 to 550 before toppings. The lolot leaf is nothing, about 1 calorie each.
Then the seller pours mo hanh over the plate, scallions fried in oil, a tablespoon is 80 calories, and sprinkles peanuts, another 60. That is how a plate of five reaches 580. It comes with mam nem, fermented anchovy sauce with pineapple and sugar, about 40 calories for a small bowl, and most tables have two.
The way it is actually eaten is the problem: as a set with banh hoi (fine rice vermicelli sheets, 200 calories for a normal serving), rice paper (60 for two sheets), and a plate of herbs and cucumber. Wrapped and dipped, the full bo la lot banh hoi is 850 to 900 calories, and it is usually an appetiser at a bia hoi table before the main dishes. Two beers on top is another 300.