Yes, it's vegan!! Mouth-watering, tender, chewy, juicy, flavourful, meat-like texture. Amazing! BBQ or pan fry then serve whole or slice and put on top of salad for a steak salad. So delicious and satisfying!
Add all of the vegan seitan steak ingredients to a food processor and pulse to combine, stopping to scrape down the sides as needed until everything is well mixed. Alternatively, if you do not have a food processor you can first mash the cooked lentils with a fork or potato masher, then add everything together in a large bowl and mix well.
Turn the mixture out onto a clean work surface and begin to knead it together. It may be a bit crumbly at first, but keep kneading it for a few minutes until it comes together into a tight ball. Cut the ball into 4 sections, then use a rolling pin to roll out each section into 1/2" thick steaks. The dough will be very tough and stretchy, but just keep working at it until you get your desired steak shapes.
Add several inches of water to a large pot with a steamer basket and bring to a boil. Put the steaks in the steamer basket and cover with a lid. It's ok if they are overlapping a bit. Steam for 25 minutes, flipping the steaks halfway through so they steam evenly. They will double in size.
In a large ziplock bag or air-tight container, mix together all of the marinade ingredients. The oil won't really combine, but that's fine. Remove the steaks from the steamer and coat in the marinade. Let marinate for a minimum of 30 minutes before cooking, or for as long as several days when kept in the fridge.
When you are ready to enjoy the vegan steaks, heat a frying pan, grill pan, or barbecue. When hot, fry or grill the steaks a couple of minutes on each side until grill marks form. Brush the steaks with leftover marinade while cooking to keep them juicy, and also right before serving.
Serve however you desire. I like mine served with a potato and some greens. I also enjoy mine sliced and put on salad. So many possibilities!
To freeze the steaks: pop the steaks in the marinade and freeze the entire thing, marinade and all. I have found that after frozen and thawed the steaks might suck up more of the marinade so you might want to whip up extra marinade for brushing on when cooking.