Greek Lentil Burgers

Ingredients

• 1 egg
• 2 cups mushrooms (chopped)
• 1/2 small onion (chopped)
• 1 clove garlic (chopped)
• 1/4 cup Fresh mint leaves
• 1 tsp dried oregano
• 1 can lentils (rinsed)
• 1 cup whole-wheat bread crumbs
• 4 thin whole-wheat burger buns
• 4 lettuce leaves
• 4 slices tomato
• 4 slices eggplant (1/2-in.-thick round slices)
• 8 thin slices cucumber ((If using English cucumber, leave skin on))
• 4 tsp olive oil (divided)