Morning 2 Midnight is an Asian grocery store and eatery on Broadway at 115th St. It stocks Japanese and other Asian foods, and sells junk food from, well, morning (7am) to midnight. It's a similar concept to Pinnacle, with a similarly dingy upstairs seating area.
The tasty burgers and cheesesteaks are remarkably cheap and said to be worth the long wait. Their kitchen closes at 11pm, which is good to remember if you're planning to have a late night meal there.