01 -
Combine the 3 lbs fresh rhubarb, trimmed and chopped into 1-inch pieces, and 1/2 cup water in a large, heavy-bottomed pot. Bring to a simmer over medium heat, then reduce heat to low. Cook, stirring occasionally, until the rhubarb is very soft and broken down, about 10-15 minutes.
02 -
Stir in 1 1/2 cups granulated sugar, 1/2 cup packed light brown sugar, 2 tbsp fresh lemon juice, 1 tsp lemon zest, 1 tsp ground cinnamon, 1/2 tsp ground ginger, 1/4 tsp ground nutmeg, 1/4 tsp ground cardamom, and a pinch of salt. This blend creates the vibrant flavor profile for the Best Rhubarb Butter Recipe.
03 -
Increase heat to medium-low and bring the mixture to a gentle simmer. Continue to cook, stirring frequently to prevent sticking, for 25-30 minutes, or until the mixture has thickened considerably and the rhubarb is completely dissolved. This simmering process is key to developing the rich flavor of the Best Rhubarb Butter Recipe.
04 -
Carefully remove the pot from the heat. Using an immersion blender directly in the pot, or by transferring the mixture to a stand blender (working in batches if necessary), blend until the rhubarb butter is completely smooth. For the Best Rhubarb Butter Recipe, ensure no fibrous chunks remain.
05 -
Return the pureed rhubarb butter to the pot (if using a stand blender). Stir in 1 tsp pure vanilla extract. Cook for another 5 minutes over low heat, stirring constantly, until it reaches your desired thick, spreadable consistency. It will thicken further as it cools.
06 -
Remove the Best Rhubarb Butter Recipe from heat and let it cool completely at room temperature before transferring to clean, airtight jars. Store in the refrigerator. Enjoy this delicious spread on toast, pancakes, or with yogurt.