Dissovle the lemon and orange jello in 2 cups of boiling water. After the jello is dissolved, add 2 cups of cold water. Add the drained pineapple to the jello mixture. Cover with miniature marshmellows. Place in fridge to congeal.
After the first layer is congealed. Take the left over pineapple juice and add enough water to make one cup of juice. Add 1 to 2 TBSPS of flour and heat over low heat, stirring constantly, (burns easily) until thickened. Set aside to let cool slightly. Once it is cooled, pour over the first layer and return to fridge.
The third layer is easy. Bring the cream cheese to room temperature and mix with the cool whip. After thourghly blended, spread over the second layer.
The fourth and top layer is shredded sharp cheddar cheese sprinkled over the top. I suppose the shredded cheese is how it got the name sawdust salad. Keep in the fridge. If it is left sitting out too long the layers being to melt.