1 small head butter lettuce, inner leaves separated
8 whole-wheat slider buns
2 Roma tomatoes, thinly sliced
1/2 small red onion, sliced into rings
How to Make It
In a medium bowl, mash avocado, sour cream, lime juice and zest, jalapeño, cilantro, 1/2 teaspoon salt and 1/4 teaspoon pepper until chunky. Press plastic wrap onto surface of guacamole and refrigerate.
Combine bison, garlic, and remaining salt and pepper in a small bowl. Form into eight 2-ounce patties, transfer to a plate, and set aside.
Preheat a grill or grill pan over medium-high heat. Grill sliders until thoroughly cooked; 4 minutes per side for medium.
Layer one lettuce leaf, a slice of tomato, and an onion ring on bottom half of each bun and top with 2 tablespoons guacamole. Add a slider, and top with other half of bun.