4-6pm at Backbar in Somerville's Union Square is dubbed the Genius Hour. I just found out that happy hours as I knew it in LA is illegal in Boston, as in they're not allowed to discount alcohol. What Boston bars/restaurants do instead is discount food or have special food items during "happy hour". Backbar's Genius Hour, then, is the only 2 hours of each day when you can get their lauded Genius Ramen.
The ramen's broth changes from season to season. In the winter you might find a rich tonkotsu (pork) broth. At the end of spring when I went, they had a chicken dashi broth, finished off with tare ($14).