Ingredients

  • 1 1/2 cups all purpose flour
  • 3 tablespoons sugar
  • 1/4 teaspoon salt
  • 1/2 cup (1 stick) chilled unsalted butter, cut into 1/2-inch cubes
  • 1 large egg yolk
  • 3 to 4 tablespoons chilled cream
  • 9 tablespoons unsalted butter, cut into 1/2-inch cubes
  • 3/4 cup sliced almonds
  • 3/4 cup (packed) golden brown sugar
  • 1 teaspoon ground cinnamon
  • 3/4 cup all purpose flour
  • 5 cups 1/2-inch-thick slices rhubarb (from about 2 1/2 pounds)
  • 1 1/4 cups sugar
  • 1/2 cup all purpose flour
  • 1 teaspoon grated lemon peel

Method

  • Blend flour, sugar, and salt in processor 5 seconds.
  • Using on/off turns, cut in butter until coarse meal forms.
  • Add egg yolk and 3 tablespoons cream.
  • Blend until moist clumps form, adding more cream if dough is dry.
  • Gather dough into ball.
  • Press enough dough into 10-inch-diameter tart pan with removable bottom to make 1/4-inch-thick crust.
  • Pierce crust all over with fork.
  • Chill at least 2 hours.
  • Cook butter in large skillet over medium heat until golden, stirring often, about 5 minutes.
  • Remove from heat.
  • Mix in almonds, sugar, and cinnamon.
  • Add flour and stir until moist clumps form.
  • Cool completely.
  • (Crust and streusel can be made 1 day ahead.
  • Cover separately and chill.)
  • Preheat oven to 375F.
  • Toss all ingredients in bowl to blend.
  • Let stand until filling looks moist, stirring occasionally, about 15 minutes.
  • Bake cold crust until golden brown, pressing with back of fork if crust bubbles, about 20 minutes.
  • Remove from oven.
  • Reduce oven temperature to 350F.
  • Spoon filling into warm crust.
  • Crumble streusel over.
  • Bake until filling is bubbling and streusel is crisp and brown, about 1 hour.
  • Cool tart on rack 30 minutes.
  • Serve warm or at room temperature.