These are buffalo burgers (which were tremendously good!), but of course this aioli and the onions would be good on any type of burger. The recipes below are good for 3-4 burgers.
Go on, tell me that's not the salaciously food porniest photo you've ever seen!
Blue Cheese and Garlic Aioli
1 cup light mayonnaise
6 cloves garlic, pressed
4 ounces crumbled blue cheese
1 tablespoon spicy Dijon mustard
couple of dashes of Worcestershire sauce
fresh-ground black pepper, to taste
Mix all ingredients together in a small bowl. Spread on burgers as soon as they come off the grill.
1 red onion, sliced into rings
2 tablespoons olive oil
1 tablespoon brown sugar
Heat oil and onions in a nonstick pan over very low heat and cook slowly, stirring occasionally. When onions begin to sweat, add sugar and stir frequently until sugar caramelises and onions are soft.