Coffee cardamom walnut cakes recipe

Ingredients

• 75 g walnut halves
• 190 g plain flour
• 0.8 tsp baking powder
• 0.8 tsp baking soda
• 1/2 tsp salt
• 1 tsp ground cardamom
• 1 tsp ground pink peppercorns (or substitute freshly ground black pepper)
• 0.8 tsp ground cinnamon
• 1 pinch ground cloves (1/8 teaspoon)
• 180 g plus 1 tablespoon unsalted butter, softened
• 150 g sugar
• 2 large eggs
• 1 1/2 tsp vanilla extract
• 210 g plus 2 tablespoons crème fraîche
• 185 g icing sugar
• 3 tbsp freshly brewed strong coffee or espresso