Slow Cooker Venison Roast Allrecipes.com. This is wonderful! Doubled the recipe since I had more deer meat. Soaked the deer meat for 24 hours prior with buttermilk. Rinsed off meat before placing in the crockpot and cut into small pieces. I "eyeballed" all the ingredients except for the soup and onion mix which I doubled. Could also make this with beef. Love it!