Start by preheating the oven to 200º.
Wash the sweet potatoes well and cut them in half.
Place them on a tray, with the peel facing down and take them to the oven for 20 min or until they are soft inside.
Let them cool a little and remove the pulp with the help of a spoon.
Put it in a big bowl, together with the tuna and reserve it.
Heat a frying pan with olive oil and add the onion cut in half slices.
Let the onion start cooking and add the salt. Mix well.
In the middle of the process, add some water so that the onion is soft and caramelized.
As soon as the onion starts to get a brownish color, turn off the heat and add the onion to the sweet potato and tuna bowl.
Add the grated cheese.
Mix everything very well, crushing the ingredients.
Make little balls with the help of the ice cream scoop and crumble them by rolling the tuna bites into the flour, the egg wash and the panko (in this order).
Place all the tuna bites on a tray. If you want them to be even crunchier, pour a drizzle of olive oil on top.
Bake for about 20 to 25 minutes or until crispy.
Serve with a good mustard, a little ketchup or do as I do and serve with curry ketchup.