Lamb Sliders with Feta Tzatziki Spread Recipe

Ingredients

• Extra-virgin olive oil
• 1 red onion, sliced, for garnish
• Kosher salt
• 8 ounces of roast lamb, which is four pieces, thinly sliced
• 4 whole small wheat pitas or 4 seeded small hamburger buns
• Feta tzatziki spread, recipe follows
• 1 beefsteak tomato, sliced, for garnish
• 2 cups baby spinach, for garnish
• 2 cups plain Greek yogurt
• 1/2 cup crumbled feta cheese
• 1 tablespoon white wine vinegar
• 2 cloves garlic, smashed and finely chopped
• 2 sprigs fresh mint, leaves cut into chiffonade
• 1 small bunch fresh dill, finely chopped
• 1/2 English cucumber, coarsely grated