Peel the potatoes, wash them and boil them in boiling salted water for about 20 minutes. Wash the tomatoes and cook the last 10 minutes. Tempura flour, egg yolk and c
Chill for 30 minutes.
Drain the potatoes and tomatoes and let them evaporate. Add butter and mayonnaise and crush everything with a fork. Season with salt and pepper.
Heat the oil in a pot to approx. 180 °C. Drain sardines on kitchen paper, pull through the tempura dough and deep-fry in the oil until golden brown. Arrange the sardines on the puree.