I'm not entirely sure how authentic this is, but I looked up various adzuki bean paste recipes since I can't get canned/jarred nearby. So I came up with this one where the first batch was too sugary so I toned it down and got it right the second time-- it's easy but not quick! Using dried adzuki beans is optimal but canned would probably do in a pinch to cut the night the beans need to soak. They must be soft and squishable. Straining overnight is important, but all in all this is easy. Adzuki paste is used in Japanese and Chinese confections and as a spread, the nutritious properties of the red beans help cancel out the pure sugar!