1poundextra lean ground beefgood quality, 90% or higher
½teaspoonground black pepper
½cupshredded cheddar cheesedivided
4pickled jalapeño sliceschopped
2hamburger bunssourdough, ciabatta or gluten-free
In a medium bowl, mix together ground beef, egg, Worcestershire sauce, onion, salt, pepper and ¼ cup cheddar cheese. You may need to use your hand to get in evenly combined. Let stand (see cooking tips section above for reasons).
Heat a medium skillet or non-stick pan to medium-high heat. Add bacon strips, cook for 3–4 minutes without touching. Rotate and cook other side 2–3 minutes, or until slightly crispy. Remove from heat, drain off excess oil, and break bacon into chunks.
Divide meat mixture in half for each burger. Press about 2/3 off one half into the burger press (it should be almost full). Press top mold to create an open center. You may need to practice a couple times to get the right amount (see animated photo above for help). Fill one burger with 1/8 cup cheese, and half of cooked bacon and jalapeño. Top with more meat and use burger press to seal top down. Remove and repeat steps for second burger.
Preheat barbecue (I used gas) to medium-high. Lightly grease grill slats with oil; this helps prevent sticking. Place patties onto grill, close, and cook first side for 4–6 minutes. It should release from the grill and have grill marks. Flip and cook other side for 4–6 minutes until cooked to desire doneness. With those times it should be just over medium. If you're used to using your fingers to test firmness, the stuffed center makes it more squishy, so be sure to not overcook.
Grill hamburger buns if desired. Mash avocado in a bowl. Place burger patties in buns, top with avocado and enjoy the best juiciest burger.