Make the filling:Combine the rhubarb, brown sugar, cornstarch, lemon juice, lemon zest, and salt in a large bowl and stir with a spatula until evenly mixed. Transfer the rhubarb mixture to the baking pan, and sprinkle the topping evenly over the fruit; the pan will be very full, but the crumble will settle as it bakes.
Bake until the topping is lightly browned, the rhubarb is tender (probe in the center with a skewer to check), and the juices are bubbling thickly around the edges, 45 to 60 minutes. Transfer to a rack to cool to warm or room temperature and to allow the juices to thicken, at least 1 hour.
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