1. Working with one bun at a time, open the sliced bun horizontally and lay face up on a cutting board or work surface. Spread each side of the bun with salsa, using one tablespoon per side.
2. Place half a slice of cheddar cheese on top of the salsa on each side of the bun. Spread two tablespoons guacamole on one side of the bun.
3. Top with four to five jalapeño rings and sprinkle with one teaspoon freshly chopped cilantro.
4. Fold over the bun to close the sandwich. Squeeze slightly to hold together, being careful not to allow any of the filling to ooze out. Continue assembling the sandwiches until all six buns are filled.