If carnitas has been refrigerated, warm it by adding olive oil to a non-stick skillet over medium heat. Add cold carnitas, cook and stir until it has warmed through and edges have crisp. Add cooking liquid or stock to moisten as desired.
For the Tostada Shells
Make homemade Tostada Shells or use your favorite store bought shells.
Heat refried beans in a small saucepan over low heat, adding water or stock if beans are dry.
How to Assemble Carnitas Tostadas
To assemble tostadas, spread each tostada shell with ¼ cup refried beans and top with ¼ cup carnitas. Layer with desired toppings and serve.
Important note on timing! I like to prepare the carnitas, refried beans and tostada shells a day in advance of serving these so that prep and cooking come together easily. When calculating how much time you'll beed, be sure to read through the whole recipe and decide ahead of time if you'll make your own tostada shells and refried beans. Note that you'll want to make the carnitas a day in advance or at least very early the morning you plan to serve these tostadas.
Nutrition information is for 2 tostadas per person and does not include toppings.