Obviously we LOVE this dreamy tzatziki / pesto combo, but if you're looking for a speedier option crumbled feta would work in place of the tzatziki (or, our fave feta brand Odysea make a creamy feta and yogurt spread that's absolutely dreamy) and of course your favourite pre-made pesto would work here too. Or you can leave the pesto out. It adds an extra layer of flavour, but you do really want something creamy with the lamb burgers.