[Sounds reasonable. He never thought he'd have to attempt culinary skills in addition to his newly practiced alchemy skills but here we are.]

I'll warn you I am terribly useless when it comes to cooking of any kind but I shall do what I can. [It's at least not that hard to figure out measurements based on simple logic. A proper chef would probably say he gets it not quite right with the amount of water he adds to each bowl but it's close enough that no near disasters will occur. Presumably.]

And you will be able to tell which is rice flour based on what it becomes? [Will it really look so different? He already forgets what flour went into which bowl...]