Pulse the remaining half in a food processor until coarsely chopped.
3
Combine all ingredients gently.
4
Refrigerate 20–30 minutes.
5
Form into four patties.
6
Cook over medium heat in a lightly oiled skillet: 4–5 minutes first side, then 3–4 minutes second side. Internal temperature: 125–130°F for medium, or 145°F if you prefer fully cooked.