LALA® Crema is available at Walmart and other select stores.
The use of the cream in this recipe reduces the spiciness of the peppers, but if you are not used to spicy foods at all, use only 1 or 2 Serrano peppers. If Serrano peppers are not available, use one jalapeño pepper.
In order to keep the tomatillos from adding a bitter taste to the sauce, make sure to buy the ones that are small to medium in size (not the big ones). Additionally, do not overcook them (after the water comes to a boil, reduce the heat so that it simmers gently).
If in any case your tomatillo sauce has a bitter taste, add a pinch of sugar.