Preheat & Prepare: Preheat oven to 175°C (350°F). Grease and line a loaf pan with parchment paper.
Heat Honey & Milk: In a small saucepan, warm the honey and milk together until the honey dissolves. Remove from heat and stir in melted butter. Let cool slightly.
Mix Dry Ingredients: In a large bowl, whisk together the rye flour, baking powder, baking soda, cinnamon, ginger, nutmeg, cloves, and salt.
Combine: Make a well in the center and pour in the warm honey mixture and beaten egg. Stir gently until just combined. Do not overmix.
Bake: Pour batter into the prepared loaf pan and smooth the top. Bake for 45-50 minutes, or until a toothpick inserted in the center comes out clean.
Cool: Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Whip Cream: While the cake cools, whip the heavy cream and powdered sugar (if using) until soft peaks form.
Serve: Slice the honey cake and serve with a dollop of whipped cream.