Ingredients:

1  tablespoon olive oil,
1  large onion, finely chopped.
1  small shallot, minced.
1  teaspoon purchased red curry paste,
1/2  cup mayonnaise or salad dressing or light mayonnaise dressing,
1-1/2  pounds lean ground beef,
4  ounces peeled and cooked baby shrimp, chopped.
2  tablespoons snipped fresh dill,
1/2  teaspoon sea salt,
1/4  teaspoon pepper,
4  large onion or sesame Kaiser rolls, split. 
Lettuce (optional), 
Sliced tomatoes (optional), 
Sweet pickle slices (optional).

Directions:

To make spicy caramelized Mayo, heat oil in a large skillet over medium-high heat. Cook onion in hot oil for 7 minutes or until browned (caramelized), stirring occasionally. Reduce heat to medium. Add shallot and curry paste; cook and stir for 2 minutes more. Transfer mixture to a mixing bowl; cover and chill. Stir mayonnaise or salad dressing into chilled onion mixture. Cover and refrigerate for 1 hour or until ready to serve.

Combine ground beef, shrimp, dill, sea salt, and pepper in a large bowl; mix well. Shape mixture into 4 patties using BurgerMate.
  

Place burger patties on the lightly oiled rack of the grill directly over medium heat. Grill for 18 to 23 minutes or until an instant-read thermometer inserted in centers register 160 degree F, turning burgers once halfway through grilling.
  
Toast rolls on grill, if desired; serve burgers on rolls. Top with some of the Spicy Caramelized Mayo, and, if desired, lettuce, sliced tomatoes, and sweet pickle slices. Makes 4 burgers.
 
Make Ahead: Make the Spicy Caramelized Mayo up to 3 days ahead of time. Cover and refrigerate until ready to use.