Viral Tunacado Sandwich

Prepare the Tuna salad
9 Combine all the ingredients in the food processor and pulse until well mixed and the texture is to your liking. You want the mixture to be creamy but with some texture.
Assemble the Pesto Tuna Sandwich
3 Butter both sides of the rustic bread slices or toast and toast them in a pan over medium heat until they are golden brown and crispy. 
4 .Spread a generous amount of the prepared tuna salad onto one side of the toasted bread.
5 Layer the spinach leaves, sliced tomatoes, and sliced red onion on top of the tuna salad.
6 If desired, drizzle some pesto over the veggies for extra flavor.
7 Place another slice of toasted bread on top to create a sandwich.
8 Serve your tuna pesto sandwich immediately and enjoy!