I thought barbeques were all about eating a months meat protiene, drinking a months beer or wine intake and good company and it didn’t matter too much if the food was 5 or -1 star.
More seriously, fish, almost any, done almost anyhow, but well, with good sauces to dip or pour make a nice change to the char grill/rare meat.
I do a good burger with garlic, chilli, toasted and crushed cumin seeds, fresh coriander and broken up haloumi…mix well form into a thick roll shape and roll in cling wrap to get that even round diameter. Chill overnight and with a very sharp knife slice into 1 inch burgers and make sure you flip them a lot while cooking to keep those juices moving through the meat.
They’d be a bit stringy by now… but mother-in-law marinaded for 48 hours in my famous barbecue sauce, that might just tenderise her enough… that and the big hammer I’d use