Cut off the green from the fennel and, if necessary, a little from the lower part of the tuber (so that the tuber does not fall apart). Wash the fennel and quarter it so that each piece is still attached to the bottom of the stalk. Put the vegetables in boiling salted water and cook for about 20 minutes until they are soft.
Arrange the fennel on two plates and drizzle with lemon juice and olive oil one after the other. Finally, grate fresh parmesan and spread generously over the vegetables.