Combine first 12 ingredients in a large bowl. Divide mixture evenly into 8 portions, shaping each into a 1/2-inch-thick patty.
Place patties on a grill rack coated with cooking spray; grill 5 minutes on each side or until done. Place buns, cut sides down, on grill rack; grill 1 minute or until toasted. Spread 1 teaspoon mustard on each bun top. Place 1 patty on bottom half of each bun; top each serving with 2 pickle slices, 1 lettuce leaf, 1 tomato slice, and top half of bun.
Prepped seasoning blend to recipe. Though we like lamb, used all beef instead of combo because that's what we had on hand. Cooked four minutes on the George Foreman. Served with lettuce & tomato in pita bread with the yogurt sauce from CL's Gyros. Moist and flavorful.
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