Restaurant: Cam Huong
City: Union City, CA

Vietnamese sandwich shops usually carry bánh đậu xanh from other small businesses. However, I might have also seen them at 99 Ranch and/or Marina Food.

banh dau xanhbanh xau danh

The texture is similar to peanut butter, but with the mung bean taste.

Bánh đậu xanh (mung bean cake) is a type of Vietnamese banh (cake or bread). It is a specialty of the Hải Dương Province. The cake is made from powdered mung beans, pureed with sugar and vegetable oil or animal fat, usually lard, and grapefruit oil. The cake is cut into small cubes and packaged into small boxes or greaseproof paper. The cake is often eaten with green tea. (Wikipedia)