Delights of Dijon — Lemon and Mustard Tuna Burger

Name: Delights of Dijon — Lemon and Mustard Tuna Burger
Ingredients: 7 oz good quality canned white meat tuna, drained and broken into shreds with a fork; 3 Tablespoons sliced green onions; 3 Tablespoons coconut flour; ¼ teaspoon coarse black pepper; ½ teaspoon sea salt; ¼ teaspoon garlic powder; 1 teaspoon dried oregano; 2 large eggs, beaten; 3 Tablespoons good quality Dijon mustard (I recommend Maille brand original Dijon); 1 Tablespoon fresh lemon juice; 1 Tablespoon extra virgin olive oil + more for frying; Olive tapenade (see the link in the first paragraph), fresh arugula, and fresh sliced tomatoes for serving; Gluten-free hamburger buns, for serving (optional)