Soy, seitan, tofu to a lesser degree.

Soy can be bought as chunks, for example, soaked in hot water and then torn to strips. These can be fried in a pan with a little oil and garlic and salt for an amazing taste and texture. If you to be fancy about it, you can probably marinate them after soaking, though the strips will absorb the marinade a little better.

Seitan can be bought as a powdery mixture that you mix with water to, essentially, get a dough that you can knead and cut into pieces of your choosing. An easy marinade could include a barbecue sauce, garlic and spices to your liking to get that classic barbecue meat taste. Fry it in a pan and you're golden.

I'm a sucker for tofu, so I'm usually good just frying it in a pan or panini press, putting it in the oven, or just eating it raw in combination with soups and stuff. But of course you can marinade tofu really well too. Just make sure to drain the water beforehand and maybe add (corn) starch for extra crispiness when frying.

Happy cooking!