Lightly dampen both sides of the bread with water, then spread wasabi paste on one side ... simply a mixture of canned tuna and mayonnaise and perfectly Japanese style, if you use the Japanese ...
Step 3: Mix the mayonnaise little by little into the wasabi paste, stirring well so that there are no lumps, and leave this in the fridge too. Step 4: Thinly cut the sourdough bread into eight slices.