Add everything to a high-speed blender and process until smooth and creamy.
Transfer the sauce to a clean glass jar or lidded container and store it in the refrigerator for up to 10 days.
Notes
If you don't have a high-speed blender, soak your cashews in cool water overnight, or soak them in boiling hot water for 30 minutes. Then drain the cashews and use them as directed. Soaking the cashews will soften them, making them easier to blend.
If you're still having trouble getting your sauce smooth, you may strain any loose cashew bits using a fine mesh strainer or a nut milk bag.
Make it nut-free and swap the cashews with shelled raw pepitas or sunflower seeds with similar results. Make sure they do not have added salt.
For lower sodium, use water instead of vegetable broth.
For less spice replace ¼ to ½ of the called-for hot sauce with broth or water.
For less tang, use only 2 tablespoons of the vinegar or sub for apple cider vinegar instead.
For a creamier/thicker sauce, use up to ⅔ cup of cashews or seeds.
Make it a smoky hot sauce and add 1 teaspoon of smoked paprika.
Store in a clean, glass jar or container in the refrigerator for up to 10 days, or freeze for up to 6 months. Use an ice cube tray to freeze it in individual portion sizes.