If you haven't heard already, Yume Wo Katare now has a sister eatery in Porter Exchange (in the former Ittyo space) called Yume Ga Arukara ("because I have a dream"). It specializes in Niku Udon. As with YWK, the menu consists only of that single item, with the option to add more beef, even more beef, more noodles, or even more noodles. It's also possible to order it without the beef altogether. Other than that, there's free water and hot tea. That's it.
Owner Tsuyoshi Nishioka imported a brand new udon making machine from Japan and he only stays open (lunch, starting at 11 am) while the freshly made noodles last--about 100 servings. When we went this morning, Tsuyoshi was there himself prepping each bowl. The udon is served cold, with a splash of bonito-shiitake broth, topped with thin slices of beef (similar to sukiyaki beef), a mound of grated daikon (with a much smaller lump of grated ginger on top), finely chopped scallions, and a lemon wedge. The "assari" (simple, light, and refreshing) flavor profile is a sharp contrast to the "kotteri" (rich, oily, and complex) Jiro-style pork ramen at YWK, and anyone with a normal appetite can easily finish a regular bowl. Next time I'll ask for extra beef and noodles.
In any case, it really hit the spot. I don't think I've had cold Niku Udon stateside, so this is a really welcome addition. One slight caveat for me is that I prefer my udon a bit chewier, but that's a small gripe.