Step 1

In a large bowl, mix together the ground turkey, chopped spinach, feta cheese, garlic, bread crumbs, Worcestershire, black pepper, and olive oil until combined.

Step 2

Divide into 4 equal portions (approximately 4 inches in diameter, 1 inch thick.)

Step 3

Transfer to a parchment-lined plate and chill in the refrigerator for 1 hour or the freezer for 20 minutes.

Step 4

Preheat a grill to medium-high and oil the grates really well.

Step 5

Grill burgers for about 4-5 minutes per side, or until no longer pink, juices run clear, and an internal temperature of 165 degrees F is reached on an instant read thermometer.

Step 6

Serve on buns with mayonnaise, cucumber, and red onion.

Step 7

NOTE: Instructions for cooking on the stovetop or in the oven are included in the full article.