Avocado Tuna Boats

Ingredients

• 1 (5 ounce) can tuna, drained
• 0.125 onion, minced
• 2 tablespoons prepared yellow mustard
• 1 tablespoon mayonnaise
• 1 tablespoon sweet pickle relish
• 1 pinch salt and ground black pepper to taste
• 0.5 avocado
• 1 tablespoon everything bagel seasoning