Black Bean Beef Burgers with Blue Cheese and Onion Marmalade

INGREDIENTS

large red onion, thinly sliced (about 2 cups)

tablespoon extra virgin olive oil

2 tsp

brown sugar

1/2 tsp

kosher salt

2 tbsp

balsamic vinegar

1 oz

can black beans, rinsed and drained

large egg, beaten

3 tbsp

extra virgin olive oil, plus extra for brushing skillet

3 tbsp

Dijon mustard, divided

2 tsp

garlic powder

1 tsp

kosher salt

1 tsp

black pepper

1 tsp

Worchester sauce

1 lb

90% lean ground beef

8 oz

Gorgonzola cheese (or other mild blue cheese), crumbled

whole wheat hamburger buns, lightly toasted