It should be stiff enough to stand and not flatten, when dropped on the paper.
You must use a little judgment in doing this, as you only need work sufficient sugar into it to make it stiff enough so that the centers will retain their shape after being moulded.
Beat slowly until the candy is stiff enough to stand and not flatten out when dropped on wax paper or buttered plates, then spoon out as directed in dropping pineapple puffs.
This center, especially, is very sticky, and you will be obliged to work enough XXXX or confectioners’ sugar into it to make it stiff enough so that you can mould it up into different shapes easily.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "stiff enough" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.