The letters not used in the food items are: O, L, I, O, P, P, O, T, H, E, S, U, I, T, F, R, U, I, T
The unscrambled letters spell: WHAT IS YOUR FAVORITE FRUIT?
Answer: The 8 food items are Tomato, Cake, Jam, Carrot, Orange, Pear, Fruit, and Lollipop. The question formed by the remaining letters is 'WHAT IS YOUR FAVORITE FRUIT?'.