I have never tried it but it won't work according to Bryanna (all the soy and seitan recipe won't work in a slow cooker). If you don't have a clay pot you can still use the loaf pans and bake it in the oven per directions of the recipe.
---------- Debbie
Cooking is like love. It should be entered into with abandon or not at all. ~ Harriet Van Horne
I have made the soy and seitan ham in the slow cooker (on low overnight, when I tried it on high it got a little spongy). The flavor is outstanding in a clay cooker, but my electric crockpot works well when I need the simplicity. I would guess the crockpot would work for the beef also.
I think it was the heavy duty cast iron pan that didn't work so well. ---------- "To cook is to create. And to create well...is an act of integrity, and faith." - author unknown