godan verb (-mu), transitive verb
mix in; fold in
Used when incorporating an ingredient or element into a mixture, often in cooking or crafting contexts.
生地にチョコチップを混ぜ込む。
Mix chocolate chips into the dough.
ひき肉にみじん切りの玉ねぎを混ぜ込んでください。
Please mix finely chopped onion into the ground meat.