4 French rolls, or 4-inch pieces of baguette, preferably whole-wheat, split and toasted or serve without bread
16 thin slices English cucumber
8 slices vine-ripened tomato
4 thin round slices red onion
Directions
Preheat grill to medium-high.
Place beef, spinach, feta, 2 teaspoons dill, oregano, cumin, garlic, ¾ teaspoon salt and ½ teaspoon pepper in a large mixing bowl. Gently combine without overmixing. Form into 4 oval-shaped patties roughly the size of the rolls.
Oil the grill rack. Grill the burgers 5 to 6 minutes per side.
To prepare yogurt sauce: Combine yogurt, lemon zest and juice, 1 teaspoon dill and mint in a small bowl. Season with a pinch of salt and pepper.
Assemble the burgers on rolls with the yogurt sauce, cucumber, tomato and onion.