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Combine rhubarb, strawberries and lemon juice in 2-quart saucepan.
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Cover; cook over medium heat, stirring occasionally, until fruit is tender (8 to 12 minutes).
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Combine ½ cup sugar and cornstarch in small bowl. Stir into fruit mixture.
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Continue cooking, stirring constantly, until mixture comes to a boil (about 1 minute).
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Continue boiling until thickened (1 minute).
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Remove from heat. Set aside.