My sister, a vegetarian for over four years now, has been one of my biggest inspirations for wanting to give up eating meat. One recent evening while I was staying at her home, she offered to make one of her favorite dishes: smoked tempeh sandwiches. My response? “What the heck is tempeh?” It turns out tempeh is a fermented soy product. The difference between tempeh and tofu is that tempeh is made from whole soybeans, while tofu is not. The soybeans are compressed into a “cake,” offering a chewy and hearty texture. Plus, it is packed with plant-based protein! The sandwiches turned out delicious. The tempeh was marinated in barbecue…