Mix the brewer's yeast with warm water in 75 g of flour to form a round loaf of the right consistency. Make a cross-shaped cut and put it to rise in a small pan with a layer of flour underneath for about 15 minutes. Make a hole in the middle of the remaining flour (about 275 g), add the sugar, salt, egg yolks, butter, grated lemon rind and the prepared yeast. Knead by adding warm water as much as necessary (a few tablespoons) and form a fairly firm dough, knead it for about 5 minutes until it comes away from the table, then add the sultanas, orange and citron cut into cubes. Leave the dough prepared in this way to rise in a mould greased with butter, rather narrow and high, until it has doubled its volume, make a cross-shaped cut and place a small knob of butter in the centre. Now put the panettone in the oven and after 10 minutes remove it quickly to open the four points caused by the cross-shaped cut, put it back in the oven for another 40 minutes at a temperature of 180°, then remove it from the oven and, before serving, leave it to cool.
Ingredients:
350 g of flour
120 g of sugar
120 g of butter
10 g of brewer's yeast
three egg yolks
4 grams of salt
150 grams of sultanas
20 grams of candied orange peel
15 grams of candied citron peel of a lemon