Topping-Preheat oven to 190ºC . In small bowl, combine butter, sugar and nuts. Spoon into well greasded and floured 25 cm fluted bundt pan. Chill while preparing batter. In small bowl, combine flour, baking soda and salt.Set aside. Place vinegar in 1 cup measuring cup, fill with milk to 1 cup line. Set aside. In large mixing bowl, combine butter, brown sugar and vanilla, beat at medium speed until light and fluffy(3-5 minutes) Add eggs, one at a time, beating well after each addition. Turn mixer to low. Gradually add flour, one third at a time, alternately with milk. Gently fold in chocolate chips. Pour into pan. Bake at 190ºC for 50 minutes. Loosen edges of cake with spatula. Immediately invert on cooling rack. Cool completely. A VERY Rich cake!! ----