Mix 60 g of soft butter in a bowl with the sugar and egg yolk. Preheat the oven to 210°C (Thermostat 7). Remove the melon skin, cut it into slices and brown in a skillet with the remaining butter. Add the honey and let slightly caramelise. Arrange the caramelised melon slices on the dough. Put the tart in the oven to bake for 10 minutes. Serve warm.