The filling is the main flavor of the tamale. Keep tasting it and make sure there is enough salt, or your tamales will be tasteless and boring.
Cut up the spinach and make sure to rinse it off well, steam or saute it, and put it in a colander and squeeze out all the excess water. Put this in a mixing bowl.
Start a hot saute pan, add the garlic onion and pepper. Cook this until the onion is soft. You can add some beer here to deglaze the pan if you want some extra flavor. Add the beans, and any other veggies, salt and pepper until it tastes good. Put this in the bowl with the spinach. Make sure to add salt until it tastes good.
Squeeze the juice from the two limes into the bowl. Add the cilantro. There you go!

who knows

15

2 bunches spinach

3 cups cooked black or pinto beans

3-5 cloves garlic (chopped, minced, whole...whatever works)

1 small onion (chopped or julliened, depends on the texture you're going for)

2 limes

1 bunch cilantro (chopped)

Chiles...this is up to your tastes and how hot you want it (I use 2 jalepenos)

Salt and pepper

Any other veggies you have in the fridge that you need to get rid of