In large bowl, sift together flour, granulated sugar, cocoa, baking powder and salt. In separate bowl, combine sour cream, egg, milk and vanilla.
In another bowl, gently combine 1 1/2 cups (375 ml) of raspberries, brown sugar and orange rind. Add milk mixture to flour mixture; mix well.
Spread batter evenly into greased 9-inch (2.5 ml) springform pan. Spoon raspberries over top, leaving 12-inch (1 cm) border uncovered.
Bake in 350F (180C) oven for 30 to 35 minutes or until cake tester comes out clean; let cool. (Raspberry centre will seem wet but will firm up as torte cools) Cover with plastic wrap, chill for at least 4 hours or for up to 24 hours. To serve, top with remaining raspberries.