Greek Smash Burger Pitas with Tzatziki

For the tzatziki:

• 1/2 cup whole milk Greek yogurt

• 1/2 a medium cucumber, peeled

• 2 teaspoons extra-virgin olive oil

• 1 teaspoon minced garlic

• 1 tablespoon minced fresh dill

• 2 teaspoons fresh lemon juice

For the burgers:

• 1 pound Snake River Farms Ground Beef

• 4 whole pitas (uncut)

• 1 cup shredded romaine lettuce

• 1/2 cup cherry tomatoes, roughly chopped

• 2 tablespoons diced red onion

• 1/4 cup crumbled feta cheese