Greek lamb koftas

Ingredients

• 12 oz extra lean ground lamb
• 1 egg
• 2 large garlic cloves (crushed)
• 1 tbsp fresh oregano (or 1 teaspoon dried oregano, chopped)
• 1 tbsp fresh thyme (or 1⁄2 teaspoon dried thyme, chopped)
• 1 large onion (finely chopped)
• 1 3/4 cups fresh whole-wheat breadcrumbs
• 1 tbsp olive oil
• 1/2 cup fresh herbs (such as basil, flat-leaf parsley and mint, chopped)
• 6 scallions (thinly sliced)
• 2 oz arugula
• 6 large pita breads
• 1 lemon (cut into six wedges)
• 1/2 English cucumber (thinly sliced)
• 1/3 cup low-fat plain yogourt