Buffalo Chicken Burgers

Name: Buffalo Chicken Burgers
Ingredients: 4 stalks celery, thinly sliced; 1/2 red onion, thinly sliced; 1/2 c. chopped flat-leaf parsley; 2 tbsp. extra virgin olive oil; 1 tbsp. red wine vinegar; zest of 1/2 a lemon; Kosher salt and pepper; 1/4 c. crumbled blue cheese; 3/4 c. light mayonnaise; 1 tbsp. fresh lemon juice; 1 tbsp. hot sauce (such as Frank’s); 2 tsp. honey; 1/2 tsp. cayenne; 1 tbsp. unsalted butter; 1 tsp. olive oil, plus more for frying; 1/2 small onion, finely chopped; 2 cloves garlic, finely chopped; 2 tsp. hot sauce; 1/2 tsp. dried thyme leaves; 1/2 tsp. red pepper flakes; 1 1/4 lb. coarsely ground chicken; 4 potato buns, toasted