Step 1

Heat oven to 9x13" baking dish, melt butter in the oven.

Step 2

Remove the baking dish from the oven after the butter is melted. Add 1 cup brown sugar and stir.

Step 3

Drain pineapple in a sieve over a 4-cup measuring cup; reserving pineapple juice.

Step 4

Add pineapple to brown sugar; mix and spread evenly. Sprinkle walnuts liberally over pineapple.

Step 5

Add water to pineapple juice to make 1 cup; then add oil and eggs. Whisk together well.

Step 6

Pour pineapple into the cake mix.

Step 7

Mix well.

Step 8

Pour the cake mix slowly and evenly over the pineapple mixture.

Step 9

Bake until cake is done, about 40-45 minutes.

Step 10

Cool slightly and turn out onto platter (scooping up any topping left in dish and spread back on the cake).