In addition to Sage's Cafe, we have....
Same owner as Sage's mostly the same menu. Everything on the menu is vegan/vegetarian. I think Sage's was (and may still be) strictly vegan, but Vertical is not. However, all of the dishes are vegetarian and I think any of them can be made vegan on request. They currently have an "Anti-Depression Special" it's $3.95 for tofu scramble, hash browns, & gravy. I've been ordering this one a lot. Also love the Philly Cheeze/Pizza Steak sandwiches which you can get with grilled portabella mushrooms, tempeh, or faux chicken inside of. Comes with a side of fries or carrot sticks. Always used to get the fries, now that I'm dieting, I get the carrot sticks- which make a better side than I would have imagined.
This place is also completely vegetarian (might be vegan, I'm not sure). It's chinese food. No one else in my immediate family likes it but me. It took me a while to warm up to the food. I kept going back because I like going places where everything on the menu is available to me. I've also, recently convinced them that I like spicy hot food. I would always ask for it spicy hot and they would always bring it mild to medium.
Long Life Vegi House
This is a Salt Lake City institution. Although, they are badly in need of a remodel. I've been eating at this place since I was 15 years old. They helped me survive my teenage years. Not strictly vegetarian as they have seafood, otherwise, all the non-seafood items are vegetarian. They have great Pot Stickers. Order as soon as you sit down if you want them as an appetizer, because they take a few minutes to make. I really like all the tofu dishes (ma po tofu, tofu with barbecue sauce, tofu with spicy garlic sauce, etc.), and their kung pao chicken (faux chicken of course) is a long time favorite of mine.
Been eating at this place since 1995. Not strictly vegetarian even though they have "Vegetarian Food For A Long Life" in big letters on the sides of the building. The first 2 pages of the menu are vegetarian. Favorites include, Tofu Lemongrass, Mu Shu Vegetarian Chicken, Vegetarian Chicken Curry Vermicelli Noodle Salad (or whatever it's called, I can never remember the exact sequence of the words in the name).
House of Tibet
Right next door to Shanghai Cafe. Both within walking distance of my residence- help explain why I got so chubby and am so poor. They have an awesome lunch buffet that has cabbage salad w/ ginger dressing, spicy potatoes, steamed vegetable dumplings, veggies in some uber-fattening sauce, spicy noodles, fried rice. I love this place as the food is so good and the guy that owns the place and cooks the food is just a genuinely good human being. I wish they were 100% veg, but, to their credit, the lunch buffet only has 2 non-vegetarian items and the always have PETA materials on display.
Chanon Thai Cafe
Thai food has hit SLC in a big way in the past few years. Chanon Thai is this little restaurant that was a late comer, but has schooled all the others in a big way. There's almost nothing on the menu that can't be made vegetarian by selecting Tofu as your "meat" of choice. It is Thai, so if you're completely opposed to fish sauce, you may need to ask which dishes are safe, as most Thai people consider fish a part of a vegetarian diet.
This is a new entry. They opened up within the last year. Not 100% veg, but very vegan friendly. About 1/3 of the menu is marked as vegan, which includes the falafel sandwiches and my new addiction, the grilled portabello mushroom sandwich. The hummus and baba ganouch are damn good at this place too. They have some tempting looking deserts and a falafel burger and fries. Haven't tried any of that yet as I keep ordering the portabella and I'm now dieting thanks to Shangai and House of Tibet.
Very veg friendly local pizza chain. I think they have 4 - 6 veg pizzas on the menu with nice ingredients like sun dried tomatoes, artichoke hearts, zuchini, spinach, etc.
The Pie Pizzeria
They have an "extreme veggie" that has fresh spinach, artichoke hearts, Sicilian spiced tomatoes, red onions, feta & mozzarella cheese on marinara sauce. We've been ordering it without any of the cheese lately and it is delicious this way.
I'm sure there's a few other places that I'm forgetting but that should help anyone who's visiting SLC or transitioning to vegetarianism in SLC out.
P.S. - Rest in Peace: Park Ivy Cafe (you're still missed), Keebas (you didn't live long enough), & Addicted Cafe/Under the Bridge (ditto on not living long enough).