Go Back

Keto Blueberry Sauce - Bright, Berry-Filled, and Sugar-Free

Print Recipe Pin Recipe
Prep Time 5 minutes
Cook Time 10 minutes
Total Time 15 minutes
Servings: 8 servings
Ingredients Method

Ingredients
  

  • Blueberries (2 cups): Fresh or frozen both work. Frozen berries make a slightly juicier sauce.
  • Granulated erythritol or allulose (3–5 tablespoons): Adjust to taste. Allulose gives a softer finish, erythritol is crisper and less sticky.
  • Water (2–4 tablespoons): Helps the berries start releasing juices.
  • Lemon juice (1–2 tablespoons): Brightens the flavor and balances sweetness.
  • Lemon zest (optional, 1/2 teaspoon): Adds lift and a fresh aroma.
  • Vanilla extract (1/2 teaspoon): Adds warmth and depth.
  • Pinch of salt: Rounds out the sweetness and makes the berries pop.
  • Thickener (optional): 1/2 teaspoon xanthan gum or 1 teaspoon arrowroot mixed with water. Xanthan is more keto-friendly; arrowroot adds a few carbs but works well in tiny amounts.

Method
 

  1. Combine ingredients: Add blueberries, 2 tablespoons water, sweetener, lemon juice, zest (if using), vanilla, and a pinch of salt to a small saucepan.
  2. Warm gently: Set over medium-low heat. Stir until the sweetener dissolves and the berries start to release juice, about 2–3 minutes.
  3. Simmer: Increase heat to medium and cook 5–8 minutes, stirring often. Lightly mash some berries with a spoon to thicken while leaving some whole for texture.
  4. Adjust thickness: If you want a thicker sauce without long simmering, sprinkle xanthan gum very lightly over the surface (about 1/4 teaspoon to start) while whisking constantly. Let it sit 1 minute to see the full effect. Add a touch more if needed. If using arrowroot, whisk 1 teaspoon with 1 teaspoon cold water and stir into the sauce off the heat, then return to a gentle simmer for 30 seconds.
  5. Taste and tweak: Add more sweetener or lemon to your liking. If the sauce is too thick, splash in more water.
  6. Cool: Remove from heat. The sauce will continue to thicken as it cools. For a smooth sauce, blend with an immersion blender once slightly cooled.
  7. Serve or store: Spoon warm over pancakes or chill for later. It’s great both ways.