Yummy Yummy is great for both lunch and dinner. The four dishes I had there were all really good. I especially recommend:
1) Squid salad - OMG! I am still thinking about this salad two weeks later. Lots of crunchy cabbage with mint, cilantro, basil, peanuts, fish sauce and all that - and perfectly cooked, right-sized pieces of squid hidden throughout.
2) Pho - beef soup with vegetables and tofu (I think it is #6) - this soup doesn't have beef in it, so ask for added beef. You will get the perfect combination of meat and veggies in this dish. A good assortment of crispy vegetables - a rarity in pho!
And the people who work there are really nice - friendly, but not too friendly. They remembered me from my first visit.