This may look like a normal cup of vanilla custard, but it had a TON of flavor packed in to the little cup! This is Shake Shack's Malted Marshmallow Peanut Butter custard, and as soon as I read "marshmallow" and "peanut butter" I had to go try it out. The peanut butter is the most dominant flavor, but you definitely get that smooth marshmallow tone as well, it's definitely different from their vanilla custard. I'm never really sure what malt actually tastes like - as far as I know it makes milkshakes thicker? But it didn't take away from the other flavors in the custard. I hope they bring this one back again soon!