Blue Cheese Burgers with Caramelized Onions and Crispy Rosemary

Blue Cheese Burgers with Caramelized Onions and Crispy Rosemary was pinched from <a href="http://www.delish.com/cooking/recipe-ideas/recipes/a52659/blue-cheese-burgers-with-caramelized-onions-and-crispy-rosemary-recipe/" target="_blank">www.delish.com.</a>
INGREDIENTS
3 tbsp. extra-virgin olive oil
4 Fresh rosemary sprigs
2 medium red onions, thinly sliced into half-moons
1 tsp. kosher salt, divided
1 1/2 lb. ground chuck
1/2 tsp. Freshly ground black pepper
4 oz. blue cheese (about 1 cup, crumbled)
4 Hamburger buns
8 butter lettuce leaves
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