Step 1

Allow butter and eggs to stand at room temperature for 30 minutes. Grease and lightly flour a 12-cup Bundt pan.

Step 2

Preheat oven to 350° F.

Step 3

Combine flour, baking powder and salt in medium bowl. Drain pineapple tidbits, reserving 1/4 cup juice. Combine reserved pineapple juice and buttermilk in small bowl.

Step 4

Beat 1/2 cup butter in large mixer bowl on medium to high speed for 30 seconds. Gradually add sugar, a 1/4 cup at a time, beating on medium speed until well combined. Add eggs, mashed banana and vanilla extract; beat well. Alternately add flour mixture and buttermilk mixture, beating on low speed after each addition just until combined. Stir in 1 1/4 cups morsels and 1/4 cup of the walnuts. Gently fold in drained pineapple tidbits, strawberries and banana. Spread batter into prepared pan.

Step 5

Bake for 60 to 65 minutes or until a wooden pick inserted near center comes out clean. Cool cake in pan on wire rack for 20 minutes. Remove from pan; cool completely on wire rack.

Step 6

Heat remaining 3/4 cup morsels, remaining 3 tablespoons butter and 3 tablespoons light corn syrup in small saucepan over low heat, stirring until chocolate melts and mixture is smooth. Use immediately. Drizzle over cake slices, then sprinkle slices with remaining 1/4 cup walnuts. Cover; refrigerate at least 2 hours before serving.