yellow cake mix (not pudding)
20oz crushed pineapple (in it's own juice)
1Heat oven to 325. 7x12"(2-qt)glass baking dish, melt butter in oven; add 1 cup brown sugar and stir.
2Drain pineapple in a sieve over a 4-cup measuring cup, reserving; add pineapple to brown sugar; mix and spread evenly; sprinkle walnuts liberally over pineapple.
3Add water to pineapple juice to make 1 cup; add oil and eggs; wisk and pour into cake mix, mixing well. Pour slowly over pineapple and bake until cake is done, about 40-45 minutes.