Scyros (Pita Sandwich)

Ingredients (14)

• + ½ cup plain yogurt add to pantry
• + ½ cucumber - peeled, seeded and finely chopped add to pantry
• + ½ teaspoon chopped fresh dill, or to taste add to pantry
• + 2 tablespoons olive oil add to pantry
• + 3 large cloves garlic, minced add to pantry
• + 1 large red onion, thinly sliced add to pantry
• + 1 pound ground beef add to pantry
• + 1 pinch dried oregano, or to taste add to pantry
• ✓ 2 stalks celery, chopped
• + 1 bunch fresh spinach, cleaned and stemmed add to pantry
• + ½ cup sliced fresh mushrooms add to pantry
• + 5 pita breads, warmed add to pantry
• + ½ cup banana pepper rings add to pantry
• + 2 tomatoes, cut into wedges add to pantry