There is a recipe where you place the tri-tip and marinated in soy sauce and scallons which makes it a great Japanese style dish or you can cook in its own juices and create a curry with a curry spice and serve with yellow rice and pita which is a great a healthy alternative.
Add a full can of PineApple slices and diced onions into the roaster about midway through the cooking proces. Replace the cooked Pineapple slices with fresh slices when served