Step 1

Preheat oven to 350 degrees F.

Step 2

Using either a food processor or a pastry blender and a large bowl, cut butter into 1 cup flour and powdered sugar mixture. If using a food processor, pulse 1 cup flour, powdered sugar and butter until you get a coarse powder mixture with pea sized bits of butter.

Step 3

Press the mixture into a 7 1/2 x 11 inch pan or a 9 inch square pan. The mixture might feel dry like a powder, and that's ok.

Step 4

Bake for 15 minutes in a preheated oven.

Step 5

Meanwhile, in a large mixing bowl, combine eggs, white sugar, 1/4 cup flour, salt and rhubarb. (To easily chop rhubarb, pulse in the same food processor bowl that you used earlier.)

Step 6

After 15 minutes, remove shortbread crust from the oven, and pour rhubarb mixture over top.

Step 7

Return to the oven, and cook for an additional 35 minutes or until set and lightly golden brown.

Step 8

Serve warm with a scoop of vanilla ice cream or whipped cream. Or let cool, and cut into rhubarb bars.