The best gf gravy I have found.
Sweet rice flour contains high levels of amylopectin starch, making it an exceptional thickener for pan sauces compared to standard grain alternatives. Unlike wheat flour, which tolerates high heat during initial browning, sweet rice flour burns easily. Melt unsalted butter over low to medium-low heat. Sprinkle the flour in small increments. Cook the resulting paste for two to three minutes until it turns a light golden brown. Pull the pan off the burner briefly before introducing any liquid. Thermal shock causes fats to separate from starches immediately.
Whisking chicken stock into the warm paste requires patience and steady mechanics. Pour the stock in small drizzles while maintaining rapid movement with a wire whisk. Adding liquid too quickly breaks the emulsion, resulting in an oily broth with floating clumps of starch. Keep the burner at low heat throughout this process. Ten minutes of continuous stirring allows the starch granules to fully hydrate and swell. Season with salt and pepper only after the target viscosity appears.