Chocolate Dipped Chocolate Madeleines

INGREDIENTS

1/2 cup

unsalted butter, plus 2 tablespoons more for greasing pans

3/4 cup

granulated sugar

large eggs

1 tsp

vanilla extract

1 cup

all-purpose flour

2 tbsp

high quality Dutch process cocoa powder

1/2 tsp

baking powder

4 oz

bittersweet chocolate, chopped

1/4 tsp

kosher salt

9 oz

semisweet chocolate

2 tbsp

dried rose petals

sea salt, for sprinkling