"The fluted exterior of a canelé is a glossy, dark-brown-almost-black shell of crunchy, carmelized sugar. Inside these small delectables have a soft, custard-like interior of rum and vanilla. Only 2 inches tall, they can be consumed in a few bites."'via Blog this'
They are SO delicious that you might be inspired to try baking your own. I've tried, and it was fun. You might be interested to know that there are molds out there to make them, for example: