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🦌 イスパタ is Hirschhorn-Salz in German. It's sulphuric, but the smell goes away when steaming. You can also use 1.5 gr baking powder instead.
➡️ Cook egg and 白あん together on low heat until no longer sticky, then strain and knead again. Add powders, then separate 20% of the dough and colour it red. The colour will intensify in the steam, so don't overdo it!
♨️ Steam them on high heat for 7-8' on a baking sheet.