Toast the bread: Toast your slices until golden and crisp. A sturdier toast holds the toppings better.
Prep the avocado: Scoop avocado into a bowl.
Add lemon juice, a pinch of salt, and pepper. Mash until mostly smooth with a few chunks for texture.
Mix the tuna: In another bowl, flake the tuna with a fork. Stir in olive oil (if using), garlic, onion, and herbs.
Season with salt, pepper, and red pepper flakes or hot sauce if you like heat.
Optional add-ins: For extra creaminess and protein, mix in Greek yogurt with the tuna. If using a hard-boiled egg, slice it for topping.
Assemble: Spread the avocado evenly over the toast. Spoon the tuna mixture on top.
Top and finish: Add sliced egg, tomatoes, capers, or arugula.
Drizzle a little olive oil and a squeeze of lemon if you want a brighter finish.
Serve immediately: Enjoy right away while the toast is still crisp.