Greek-Style Quinoa Burgers

INGREDIENTS

• 1/2 cup rinsed quinoa
• 1 medium carrot, cut in large chunks
• 6 scallions, thinly sliced
• 15 ounces great northern beans, drained and rinsed
• 1/4 cup plain dried breadcrumbs
• 1 large egg, lightly beaten
• 1 tablespoon ground cumin
• Coarse salt
• Ground pepper
• 2 tablespoons olive oil
• 1/2 cup plain nonfat Greek yogurt
• 1 tablespoon fresh lemon juice
• 4 pitas (each 6 inches)
• 1/2 English cucumber, thinly sliced diagonally