Braising is basically browning the main ingredient in fat by searing. Then simmered in liquid on a low heat. Make sure the crock pot is covered. You can use pressure cooker or a famously known Dutch oven. Some range of enameled pans or pots for stove or oven works well too. This is a recipe for beef brisket
It is quite difficult to find reindeer video recipe on youtube that is in English.