5cupsfresh rhubarbchopped (about 1½ lbs / 680 grams), frozen works as well
2tspsof cream of tartar
10cupsboiling water(2.4 liters)
1/2cupgranulated sugar(100g), or to taste
2tbspfresh lemon juice (30 mL)
Optional
1 cupstrawberries or raspberries for a fruity variationsliced, for a fruity variation
Instructions
Rinse the rhubarb stalks thoroughly and trim off the ends. Chop into 1-inch pieces, discarding any leaves.
In a large pot over medium-high heat, bring 10 cups of water to a rolling boil. Add chopped rhubarb, reduce heat to medium-low, cover, and simmer for 15 minutes until rhubarb is very soft.
Remove from heat. Once warm (not hot), stir in cream of tartar. Cover and let steep at room temperature for 24 hours.
After 24 hours, strain the mixture through a fine mesh sieve or cheesecloth into a large bowl or pitcher, pressing the pulp to extract all the juice.
Stir in fresh lemon juice and granulated sugar, starting with ½ cup and adjusting to taste.
Pour into a glass jar and refrigerate. Once chilled, pour off the clear pink juice into a clean jar, leaving any sediment behind.
Store in an airtight container in the refrigerator for up to 10–14 days.
Notes
For a fruitier flavor, add 1 cup of sliced fresh strawberries or raspberries during the boiling step.
•Honey or pure maple syrup can be substituted for granulated sugar.
•If cream of tartar is unavailable, it can be omitted — the juice will still taste delicious but may be less vibrant in color.
•Frozen rhubarb can be used in place of fresh; no need to thaw before adding to the pot.
•To freeze: Pour cooled juice into freezer-safe jars, leaving 1 inch of headspace, and freeze for up to 3 months.
•Nutritional information is approximate and will vary based on the amount of sugar added.