Combine yogurt, cucumber, 1/2 teaspoon herb mix and salt in a small bowl; reserve.
Shape ground beef into four 1/2 inch thick patties. Sprinkle remaining 1 1/2 teaspoons herb mix over both sides of patties. Meanwhile, heat large nonstick skillet over medium heat 5 minutes. Place patties in skillet and cook 6 to 8 minutes, turning once.
Season with salt, if desired.
To serve, place a burger in each pita half; add 2 tomato slices and yogurt sauce as desired.
Combine ingredients.
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