A refreshing, tangy-sweet frozen drink made with rhubarb, perfect for hot summer days or entertaining guests.

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In a large pot, combine chopped rhubarb and water. Bring to a boil and simmer for about 15-20 minutes until rhubarb is soft.
Strain the mixture through a fine mesh sieve or cheesecloth to remove solids, keeping the juice.
Stir in sugar, strawberry gelatin, lemon juice, and pineapple juice into the hot rhubarb liquid. Mix until everything is dissolved and combined.
Let the mixture cool, then transfer it to a freezer-safe container.
Freeze for several hours or overnight until slushy.
To serve, scoop the slush into a glass and top with lemon-lime soda.