Twice now recently I've done reverse-seared burgers. Third-pound 80/20 patties seasoned with SPG, smoked at 225F until internal temp at about 130F, then finished at 400F to char the outside. First time I did both the low-and-slow part of the cook and the sear part of the cook without drip trays. Low-and-slow on the left, high-and-fast on the right. Second cook I did the low-and-slow on the left over a drip pan and high-and-fast still open to the grates on the right. Both turned out amazing; enough so that my family now won't let me do burgers any other way. But both times when I opened the lid to flip during the high-and-fast, the right side burst into flames. And both times the pit was completely cleaned before the cook. I guess next time I'll try the sear also over a drip pan also--I suppose the juiciness of the patties is going to cause flames if exposed to fire no matter what. Just a public service announcement for anyone that might try the same method for burgers. I'll report back if the sear turns out good enough next time over the drip pan.