Preheat oven to 400 degrees. Spray a small baking sheet with non-stick cooking spray.
Add pork, onion, 3 garlic cloves, oregano, rosemary, 1/2 teaspoon salt, panko and egg yolk to a medium bowl. Use hands to mix the ingredients until combined. Use a small ice cream scoop to form the mixture into 13 meatballs. Place on prepared baking sheet. Bake for 15-20 minutes or until cooked through and golden brown.
While meatballs cook, add farro, 1/2 teaspoon salt, 2 cups water and chicken stock to a medium pot. Bring to a boil and then reduce to a simmer. Cover and simmer for 10-12 minutes or until liquid is evaporated and farro is cooked. Add 3 tablespoons lemon juice, honey, dijon, olive oil and parsley. Stir to combine. Season with salt and pepper.
Add tahini, remaining grated garlic clove, water, lemon juice and salt together in a small bowl. Season with salt and pepper.
Evenly divide farro between four bowls. Divide meatballs, cucumber and tomato between bowls. Drizzle with tahini sauce. Sprinkle with feta cheese.