背脂チャッチャ - Pork Fat cha-cha Ramen
背脂チャッチャ (pork fat cha-cha) is an extremely heavy ramen that has been around Tokyo for the last 30 years or so. 背脂 refers to the thick layer of cooked pork fat which they run through a strainer and rain down the little pieces of fat into the bowl of ramen. The チャッチャ "cha-cha" is supposedly describing the movement/sound of straining the pork fat.
This rich oily soup is usually a great match with raw minced garlic or 紅生姜 (pickled sweet ginger), most of these stores will have these extra toppings available on the table.
While many "pork fat cha-cha" style ramen stores use a pretty rich soup to begin with, there are some rare stores that start out with a lighter soup.
★★ ばんからら～めん (Bankara ramen) - Tokyo
★★★ 野方ホープ軒 (Nogata Hope-ken) - Tokyo
★★ ラーメン 二郎 (Ramen Jiro) - Tokyo
★★ らーめん 香月 (Kazuki) - Tokyo