Burgers with Blue Cheese Mayo and Sherry Vidalia Onions

Ingredients

• 2 cups arugula loosely packed
• 1 teaspoon pepper black divided freshly ground
• 2 ounces cheese blue crumbled
• 2 teaspoons thyme sprigs fresh divided chopped
• 1 pound ground sirloin lean
• 6 ounce hawaiian rolls whole-wheat 100% with sesame seeds, toasted
• 0.1 teaspoon kosher salt 
• 0.3 cup mayonnaise 
• 0.5 teaspoon olive oil extra virgin extra-virgin
• 0.3 teaspoon hot sauce hot (such as Tabasco)
• 2 teaspoons sherry vinegar 
• 1 inch tomatoes 
• 1 inch onion sweet

Equipment

• bowl
• grill
• ziploc bags

Directions

1. Preheat grill to medium-high heat.
2. Combine 1/2 cup blue cheese, mayonnaise, 1 teaspoon thyme, and hot pepper sauce in a small bowl; stir well.
3. Divide beef into 4 equal portions, shaping each portion into a 1/2-inch-thick patty.
4. Sprinkle beef evenly with 1/2 teaspoon black pepper and salt.
5. Brush oil evenly over both sides of onion slices; sprinkle with remaining 1/2 teaspoon pepper.
6. Place the patties and onions on grill rack coated with cooking spray; cover and grill for 3 minutes on each side. Set patties aside; keep warm.
7. Place onion slices in a zip-top plastic bag; seal.
8. Let stand 5 minutes; toss with remaining 1 teaspoon thyme and vinegar.
9. Spread cut sides of buns evenly with mayonnaise mixture. Arrange 1/2 cup arugula on bottom half of each bun; top with 1 patty, 1 onion slice, and bun top.