This stack can be prepared the day before. The egg white, however, must be whisked and folded in at the last moment. Experiment by creating your own fillings for the layers or even using up leftovers.
To prepare the tomato filling, melt the butter in a pan, add the shallot, cover and cook for 4–5 minutes, or until transparent. Stir in the paprika for 1 minute, add the tomato paste and stir over low heat for another