For once, they DON'T end up with something they shouldn't have been able to make. They've discovered a limit to their culinary ability.

This may confirm they're performing alchemy.

So THIS is their limit...

I seriously thought they were gonna spawn curry yet again inside that pot somehow... man. If it were like that, I think I can say their abilities far surpass Sanae's miracles...

Don't worry, hang in there osa-yukkuri!