Omgg I LOVE this place!! I've been searching for a good ramen spot ever since I moved to the Phoenix/ Mesa area, and Tampopo is the best place I've found!
Everything I've tried so far has been amazing -I always love to add menma, but I'd be happy enough with just the basics of soft boiled egg and slice of pork... it's really the broth that makes their ramen so great in comparison to any other place I've tried in Arizona!
They've always been crowded when I've come, so be prepared for a bit of a wait. It's definitely worth it tho, or you could always do take-out! Also, while I think their portions are pretty generous, you can add extra noodles at like no cost (or maybe $1 at most?).
My only advice would be to stay away from the optional hot sauce -it's like $1 but just tastes synthetic.. like there's only an extreme spice but no added flavor. That's the only thing that's not really worth it imo :)