To make a flour slurry, follow these simple steps:

1. Measure the flour: Start by measuring your flour. A typical ratio is 1 tablespoon of flour to 2 tablespoons of water, but you can adjust depending on the thickness you need.
2. Add cold water: Pour the cold water into a small bowl or cup. It's important to use cold water because warm or hot water can cause the flour to clump.
3. Whisk until smooth: Use a whisk or fork to stir the flour and water together until smooth. You want a mixture with no lumps, like a thin paste.
4. Slowly add to your dish: Once your slurry is smooth, slowly pour it into the hot dish you're thickening, like a soup, stew, or sauce. Be sure to whisk or stir continuously as you add the slurry to prevent lumps from forming.
5. Cook until thickened: Continue to cook and stir the mixture until it thickens to your desired consistency, usually a few minutes.

This method is great for thickening without adding too much flavor or texture.