Ok, here's what you do:
2 lbs groud beef
1 cup grated sharp cheddar cheese
2-3 serrano chili peppers (clean out the seeds, trust me) minced
4 cloves garlic minced
Teaspoon cumin
Half Teaspoon salt
Mash it all together, bbq it, toast your bun, and put it together with lettuce, tomato, guacamole, and fire roasted tomato salsa.
You will die from flavor overload, I guarantee it!