Line a 12-section bun tray with paper cake cases. Put the raisins in a small saucepan with the Marsala or sherry and heat until bubbling around the edge. Simmer for 1 minute, then remove from the heat and turn into a bowl. Leave to cool.
Put the butter, muscovado sugar, vanilla extract, eggs, flour and baking powder in a separate bowl and beat with a hand-held electric whisk for about a minute until light and creamy.
Drain the raisins thoroughly, reserving the unabsorbed Marsala or sherry, and stir into the cake mixture. Divide between the cake cases.
Bake in a preheated oven, 180°C (350°F), Gas Mark 4, for 20 minutes or until risen and just firm. Transfer to a wire rack to cool.
Put the ricotta in a bowl and gently stir in 1 teaspoon of the reserved Marsala or sherry and the icing sugar – don't overbeat the mixture or it will become too runny.
Pierce the tops of the cakes with a skewer and drizzle with the remaining Marsala or sherry. Spread the ricotta mixture on top. Use the flaked almonds and raisins to decorate each cake with a simple flower shape.