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Rhubarb Sauce

Rhubarb sauce with tangy pink rhubarb and sweet sugar simmered until thick and spoon-coating. Cooked to a glossy, dessert-ready texture that pairs well with pastry and crisps.
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings: 4 servings
Course: Dessert
Cuisine: American
Calories: 320
Ingredients Equipment Method Notes

Ingredients
  

Rhubarb sauce
  • 1.5 lb rhubarb Trim and chop into small 1/2-inch pieces.
  • 0.75 cup granulated sugar Add in full; adjust later to taste if needed.
  • 0.25 cup water Helps rhubarb soften and releases juices for simmering.
  • 1 lemon zest Brightens the finished sauce.
  • 2 tbsp lemon juice Adds tang; start with 2 tbsp and adjust.
  • 1 tsp cornstarch Use to thicken if you prefer a spoon-coating consistency.
  • 1 tbsp cold water Stir with cornstarch before adding to the simmering sauce.
  • 0.5 tsp vanilla extract Optional, for a warmer rounded flavor.

Equipment

  • 1 Dutch oven

Method
 

Cook the rhubarb
  1. Combine chopped rhubarb, sugar, and water in a Dutch oven, then bring to a gentle simmer over medium heat. Cook for 10-15 minutes, stirring occasionally, until the rhubarb breaks down and releases juices and looks pink and glossy.
  2. Stir in lemon zest and lemon juice, then continue simmering over medium heat for 10-15 minutes. Cook until the mixture has reduced slightly and thickened to a loose sauce that holds shape on the spoon.
Thicken and finish
  1. Whisk cornstarch with cold water in a small cup, then pour it into the simmering sauce while stirring. Simmer for 2-3 minutes until the sauce turns noticeably thicker and coats the back of a spoon.
  2. Remove from heat and stir in vanilla extract, if using. Taste and adjust sweetness or lemon to balance, then let stand 5 minutes to thicken further.

Notes

Prep ingredients ahead so the simmer goes quickly. For best texture, let the sauce rest 5 minutes after cooking before serving; refrigerate in an airtight container for up to 4 days and reheat gently on the stove. Freezing is yes—freeze up to 2 months, thaw in the refrigerator, and reheat with a splash of water. For a lower-sugar option, replace part or all of the granulated sugar with an equal-measured alternative sweetener designed for cooking (follow package guidance for quantity).