Preheat the oven to 375 degrees F.
For the streusel topping: Put the flour and salt in a medium bowl and, using your hands, rub in the brown sugar. Stir in the melted butter with a rubber spatula until the mixture is evenly moistened. Pop it in the freezer while you make the rhubarb filling.
For the rhubarb filling: Toss together the rhubarb, flour, sugar and salt in a large bowl. Stir in the strawberry preserves. Cut the cold butter into little pieces and stir into the rhubarb mixture.
Divide the rhubarb filling among four 4-ounce ramekins. Top with the streusel topping, squeezing and crumbling it to make both larger clumps and sandier bits.
Bake the ramekins on a baking sheet until the filling is bubbly and the streusel is crisp, about 20 minutes. Serve warm or cooled with vanilla ice cream.
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