Place frozen dish in fridge to thaw overnight.
Remove tamales from the container and place into a steamer basket inside of a large pot.
Add 1-2 inches of water to the pot (ensure water doesn’t touch the tamales). Cover tightly and set to medium heat.
Steam for 30-40 minutes until heated through and the corn masa is firm and easily peels away from the husks.
Serve with a simple Salsa Verde.