Melt the butter, then stir in the honey and let it cool slightly.
In a bowl, whisk together the flour, baking powder, shredded coconut, vanilla sugar, a pinch of salt, and cinnamon.
In another bowl, whisk the eggs, then gradually add the cooled honey-butter mixture.
Pour the wet ingredients into the dry ingredients, mix until just combined, then add the milk to create a softer batter.
Preheat your grill to medium heat (about 350°F/180°C) and prepare a BBQ baking sheet or a heat-resistant baking pan.
Pour the batter into a smaller baking pan and spread it evenly.
Place the pan on the grill, cover, and bake for 20-25 minutes, or until the sponge cake is set and golden brown.
Check with a toothpick: if it comes out clean, it's ready.
Let it cool for 10 minutes, then slice and serve, optionally garnished with extra shredded coconut and a drizzle of honey.
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