Bring fat, cream and sugar to the boil in a saucepan while stirring. Chop the cherries. Add flaked almonds, pistachios and cherries to the fat-sugar mixture and simmer for about 2 minutes at low heat, stirring occasionally. Stir in flour. Let rest for about 15 minutes. Line two baking trays with baking paper. Using a teaspoon, spread the Florentine mixture as a heap at a large distance on the baking trays.
Press a little flat. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for 8-10 minutes. Remove the Florentine carefully from the baking tray and let it cool on a cake rack. Chop the chocolate coating and melt in a hot water bath. Coat the underside and edges of the cookies with the chocolate. Leave to dry