Rhubarb Crumb Bars

Rhubarb Crumb Bars

These bars are crunchy-bottomed with that deep flavor of oats caramelized in butter and brown sugar, and then they're topped with a jammy rhubarb layer and a few tender crumbs. The rhubarb is, as it always is if you use enough sugar, both achingly sweet and jaw-crampingly tart, and the bars are so perfectly what I had in mind that I had to keep saying immodestly to our friends, "Aren't these so good?" And yes, they agreed happily, they are.

On the first night we ate the bars with whipped cream, but leftovers were eaten bare and they were delicious this way too.

Yield: Serves 12
Active time: 20 minutes
Total time: 1 hour 10 minutes


2 cups flour
1 cup rolled oats
1 1/4 cups brown sugar
1/2 teaspoon kosher salt (or half as much table salt)
1 cup butter (2 sticks; I use salted), sliced into small pieces
6 cups sliced rhubarb (about 2 pounds before trimming and cleaning)
1 1/2 cups white sugar
4 tablespoons cornstarch
1/2 cup water
1 teaspoon vanilla


  1. Heat the oven to 400 and heavily grease a lasagna-sized (11- by 7-inch) baking dish.
  2. In a large mixing bowl combine the flour, oats, brown sugar, and salt. Now add the pieces of butter and toss to coat them with the flour mixture, then use your fingertips to rub the butter into the dry ingredients. This is a messy but not unpleasant job: you'll be lifting handfuls of the mixture up out of the bowl, then gently letting it fall through your fingertips as you rub it together (I swear I'm going to make a youtube video of this one day). Eventually, you'll have a bowl full of pebbly crumbs, which is what you're going for.
  3. Reserve a heaping cup of crumbs, and press the remaining crumbs into the baking dish, patting them down firmly to form a bottom crust.
  4. Spread the sliced rhubarb evenly over the crust.
  5. Now, here's a weird step that was in multiple recipes, and so I tried it, even though normally I would toss the sliced rhubarb with flour and sugar instead of doing anything so strange as creating a separate syrup: in a small saucepan combine the white sugar and cornstarch; stir in the water and cook the mixture over medium heat, stirring constantly, until it turns clear and thickens slightly -- around five minutes. It will foam up and it will never get especially thick, but this seems to be okay. Remove it from the heat, stir in the vanilla, and pour it evenly over the rhubarb.
  6. Sprinkle with the reserved crumbs and bake the pan for ten minutes at 400 before turning the temperature down to 325 and baking for another 40 minutes.
  7. Serve in squares, warm or at room temperature, with or without whipped cream or vanilla ice cream.

Read more about Catherine making rhubarb crumb bars with her family.

See all recipes from Catherine Newman's "Dalai Mama Dishes" blog.

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