1 pt blackberries (2 Cups)
1/2 cup granulated sugar
1 tsp grated lemon rind
2 tsp fresh lemon juice

Jelly roll:

1/4 Cup confectioner's sugar
1 Cup all purpose flour
1 tsp baking powder
1/4 tsp salt
4 eggs
3/4 Cup granulated sugar
2 t grated lemon rind
1/4 cup fresh lemon juice
1 t vanilla

Prepare filling: Combine blackberries, sugar and lemon rind and juice in saucepan. Heat over medium high heat 5-7 minutes, until berries have released their liquid and can be easily broken apart with a spoon. I would add some cornstarch, maybe a teaspoon or so, because the stuff is SO runny! Cool completely.

Prepare jelly roll: Heat oven to 375. Coat 15x10x1 1/2 inch jelly roll pan with nonstick cooking spray. Line with waxed paper; coat paper with spray. Dust clean kitchen cloth with 2 T of the confectioner's sugar.

Whisk flour, baking powder and salt in small bowl. In medium sized bowl, with electric mixer on medium speed, beat eggs for about 5 min. until thick and lemon colored. Gradually add granulated sugar until will blended. Beat in lemon rind and juice and vanilla. Gently fold in flour mixture until well combined. Scrape batter into prepared pan, spreading evenly.

Bake in 375 oven for 12-15 minutes or till top springs back when lightly touched.