Hot Peppers

I blend my sauces in a blender and add a very small amount of xanthan gum to stabilize it and bring it up to the thickness that I want.

You can try using a sieve or food strainer. Put your mash on the strainer and push it through with a wooden spoon. I recently purchased a food mill and love it. It really does the trick. I use it for tomatoes when I'm making tomato sauce too.