Upside Down Rhubarb Cake

I have never tried anything with rhubarb before and lately I have been seeing it in every magazine.  The one in Martha Stewart looked so intriging, I just had to try one.  The recipe is a variation of the one I saw in the magazine.  I believe that within certain boundries you can successfully change certain ingrediant wheather it is because of taste or out of necessity, because you don't have on hand certain things you need.Give this one a try.

Rhubarb Upside Down Cake

Ingredients

Makes one 9-inch cake; Serves 10

FOR THE TOPPING

4 tablespoons unsalted butter, melted

1/2 cup all-purpose flour

1/4 cup  brown sugar

Coarse salt

FOR THE CAKE

1 1/2 sticks unsalted butter, room temperature, plus more for buttering pan

1 pound rhubarb, trimmed and cut on a very sharp diagonal about 1/2 inch thick

1 3/4 cups sugar

1 1/2 cups all-purpose flour

1 1/2 teaspoons baking powder

Coarse salt

1/2 teaspoon finely grated grapefruit zest plus 1 tablespoon fresh grapefruit juice

2 large eggs

1 cup sour cream

Directions

Preheat oven to 350 degrees. Make the topping: Stir together butter, flour, sugar, and 1/4 teaspoon salt until moist and crumbly.

Make the cake: Butter a 9-inch round cake pan (2 inches deep). Dot with 4 tablespoons butter (cut into pieces). Toss rhubarb with 3/4 cup sugar; let stand for 2 minutes. Toss again, and spread in pan.

Whisk together flour, baking powder, and 1 1/2 teaspoons salt. Beat remaining stick butter and cup sugar with a mixer on medium speed until pale and fluffy. Beat in zest and juice. Beat in eggs, 1 at a time, until incorporated, scraping down sides of bowl. Beat in flour mixture in 3 additions, alternating with sour cream, until smooth. Spread evenly over rhubarb. Crumble topping evenly over batter.

Bake until a toothpick inserted into the center comes out clean and top springs back when touched, about 1 hour. Let cool for 10 minutes. Run a knife around edge of cake, and invert onto a wire rack. Let cool completely.

Let the cake cool for 10 minutes before removing it from the pan. The rhubarb will be too hot to handle safely right after baking. But if the cake sits much longer, it may stick.

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