Another popular pizza topping in Costa Rica is shrimp ... But the four fish on the Mockba pizza are tuna, salmon, mackerel and sardines, according to the website The Daily Meal.

and a canned tuna pizza crust is both low-carb and gluten-free. It can also open up your imagination to unexpected topping ideas we associate with canned tuna, like crunchy celery, vibrant dill ...

tuna and salmon. The whole pizza is then garnished with fish roe, herbs and onion – and often eaten cold. Other common toppings on Russian pizzas? Sour cream, mayonnaise, sliced hard-boiled egg ...