Smashed Chickpea Sandwich with Harissa Yogurt

Ingredients

• 4 slices of Terra Breads Cheese Bread
• 1 large shallot, finely chopped
• 1/4 tsp finely grated lemon zest
• 1 cup fresh lemon juice
• 1 small garlic clove, divided
• 15.5oz can of chickpeas, rinsed
• 1 celery stalk, finely chopped
• 1/4 cup chopped cilantro
• 4 tbsp extra-virgin olive oil, plus more for drizzling
• Pinch of salt
• 2 cups plain Greek yogurt
• 2 tsp harissa paste