Excerpt from sirenechocolate.com:
"To craft this bar, we make white chocolate, then roast the finished batch in the oven to caramelize everything giving it a dulce de leche sweetness. For those wondering about White Chocolate: 50% of a cocoa bean is cocoa butter (the other half is the cocoa solids that are made into cocoa powder). So yes, it is chocolate, it just doesn't have the cocoa powder in it, only the cocoa butter. Definitely a sweet treat."