1 ¼lbground turkey93 percent lean for best juiciness
1 ½cupsfresh spinachminced and packed
4ozfeta cheesecrumbled
2garlic clovesminced
¼cupItalian-style breadcrumbs
2tspWorcestershire sauce
¼tspfreshly ground black pepper
1 ½Tbspolive oilplus a little extra if pan-searing
For serving
4hamburger bunslightly toasted
Mayonnaise or preferred spread
Thin cucumber rounds
Paper-thin red onion slices
Instructions
Mix the ingredients
Place turkey, spinach, feta, garlic, breadcrumbs, Worcestershire, pepper, and olive oil in a large bowl. Gently fold with a fork or your fingers until just combined.
Shape the patties
Divide the mixture into four equal portions. Flatten each to about four inches wide and one inch thick. Press a shallow dimple in the center of each patty to help them cook evenly.
Chill for firmness
Set the patties on a parchment-lined plate, cover, and refrigerate one hour or freeze twenty minutes. Chilling lets the breadcrumbs hydrate and helps the burgers hold together.
Preheat the grill
Heat the grill to medium-high, about 400 °F, and oil the grates well to prevent sticking.
Cook the patties
Grill for four to five minutes per side, turning once, until an instant-read thermometer reads 165 °F in the center. Move patties to a cooler spot if flare-ups occur.
Assemble and serve
Rest cooked patties for two minutes. Place on toasted buns with mayonnaise, cucumber slices, and red onion. Serve hot.