Latin American Street Food's Bean Stuffed Masa Cakes

This is an easy, fun finger food that has a really good flavor.  I served this with salsa and a slaw that was suggested by the author of Latin American Street Food, and it was really delicious.  We all gave this a 9, and each cake, or pupusa was 163 calories.

3 c masa harina
3 1/4-3 1/2 c warm water
1 1/2 c refried beans (I used canned)

Mix the masa harina and the water together.  Let rest for 10 minutes.  Heat a griddle to about 375 degrees, then wet your hands and divide the masa into 12 portions.  Place 1 heaping tablespoon of the beans in to the center of each masa portion, then form a circle around the beans.  Flatten the cake with your wet hands, being careful to not expose the beans.  Cook the cakes on the griddle, about 5 minutes per side.  Serve with the slaw and salsa, or whatever toppings you desire.