mustard 's last standing (named only senf 's here) is a boulder institution and is a restaurant that is a vegetarian menu for a really long time (before it was popular to do this) and everything on it is great. senf 's serves a line of tofurky and tempeh products on their vegetarian menu: vegetarian / vegan chili, tempeh burger, veggie dog (voted among the top vegan hotdogs in the country) tofurky pfeffer discs/reubs, and soy Italian sausage. their fries are freshly cut and crispy. my favorite sandwich here is the tofu reuben. (It's not really tofu, it's tofurky pfeffer deli slices) with sour wort and pickles. (vegetarians can do it with a thousand island and cheese naturally) I add düsseldorf senf to it and sweet baby ray 's bbq sauce and it makes a good replacement for reuben dressing. the rest of the family loves their soy Italian sausage sandwich. (Note: some of the bungalows are vegan, but you are not, so make sure to ask about it when they are 're vegan' sandwiches come with the beats of their choice like sourwort, hot paprika, grilled paprika, tweezers, tomato etc. and the Italian soyworst comes with grilled paprika, tweezing and marinara. a cool thing about mustard 's is when they ask, they give them a deck so that they have a picnic on quite/schattig boulder creek that runs next to the restaurant. the inside seats are limited and can be overfilled, but there are also seats in the open on the terrace. a month in the year they do vegetarian month where they specials on the veggie article (mostly juni, I think) so good! *edited cons: 2019 I was wrong, they have toilets on the ground!