Heat the olive oil in a pan.
Chop shallots and cook for 3 minutes.
Pit cherries (easier with a cherry pitter) and add cherries, balsamic vinegar, sugar and red wine to the pan.
Cook over a low-medium heat for 20 minutes until the liquids become thick and glossy.
While the cherries are reducing, preheat the grill to a high heat.
Season lamb burgers with salt and pepper on both sides and grill for about 5 minutes per side.
Once they're cooked, transfer to a plate and let rest for 5 minutes.
Grill the buns for a few minutes until lightly grilled.
Play a burger on the bun and top with cherry relish.