In a medium bowl combine the melted butter, flour, rolled oats, brown sugar, cinnamon and salt. Mix until crumbly. Press half of the mixture into an 8 or 9 inch baking dish.
Arrange rhubarb over top of the crumb mixture.
In a small saucepan mix the white sugar and cornstarch. Stir in the boiling water. Cook and stir until thick. Remove from heat and stir in vanilla. Pour syrup evenly over the rhubarb.
Sprinkle remaining crumb mixture over top. Bake at 325 degrees F. for 50 to 60 minutes, until topping is golden and the rhubarb is tender. Serve warm. Add a scoop of vanilla ice cream for an extra treat!
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