Garlic Avocado Burger with Horseradish Mustard

I had made some hamburgers last Summer from a Bobby Flay recipe that were a big hit. Well, I wanted to make those burgers again, but I couldn't find his recipe so I punted and made these instead. They were so yummy that I'm glad that I couldn't find his recipe after all.

Burgers
1 lb. ground sirloin
2 large cloves garlic, minced
1/2 teaspoon Tabasco sauce
1 tablespoon Worcestershire sauce
salt and pepper to taste
2-3 slices sharp cheddar cheese
2-3 slices muenster cheese
2 or three hamburger buns, toasted the on grill
sliced avocado
sliced baby dill pickles
horseradish mustard (recipe follows)

Combine ground sirloin, garlic, Tabasco, Worcestershire, salt and pepper in a bowl and mix well. Form into 2-3 larger patties and place on grill. For medium burgers, grill for 4 minutes at 500 degrees then flip burgers and turn down the heat to 275 degrees for about 3 or 4 more minutes. Turn the grill off and add the cheese to the tops of the burgers. Cover the grill and let cheese melt for about 1 minute, then remove burgers. Place buttered buns on the grill to let toast while cheese is melting on the burgers. Remove burgers and buns from the grill and assemble burgers with horseradish mustard, avocado, pickles, and serve.

Horseradish Mustard
1 Tablespoon horseradish (temperature is up to you, but I prefer hot)
2 tablespoons Dijon mustard

In a small bowl mix horseradish and Dijon mustard. Spread on burgers or chicken to add a kick to your meat.