What is Reddit's opinion of Hamilton Beach 040094597628 59762 2-Speed Hand Blender, Metallic, 2-Piece?

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You're panicking!

That doughy state is a normal part of the roux process. Just keep slowly adding your liquid and whisk until it turns into a thick paste and then eventually... sauce.

Just keep whisking, whisking, ^whisking!

And then to keep things simple, fast and easy... I reccomend adding an immersion blender (something like this) to your kitchen arsenal.

Don't worry about lumps with roux, it rarely ever happens.

And to prevent lumps from forming while using corn(or other) starch, first make it into a slurry and then add it to your sauce. A slurry is simply liquid and starch mixed together slowly. It will go all non-newtonian if you try to mix it with too much force. It's pretty interesting!

There are other ways to gain weight if you don't like peanut butter. Have you tried other kinds of nut butter like almond butter? Avocados, etc.? You might also have luck mixing PB2 into your shaker, but you still probably need an immersion blender.