In a large bowl, add the pudding and well drained crushed pineapple; mix well.
Stir in the food coloring; mix it in thoroughly.
Fold in the Cool Whip; be sure to blend it in thoroughly.
Stir in the marshmallows, and then the walnuts.
Cover the bowl, and chill in the refrigerator for a while, until ready to serve.
*Note: I usually make this salad the night/day before I'm going to serve it; this way it chills up nicely in the fridge. Also, I did use one (3.4 oz.) box of instant pudding mix for this recipe. I see Recipezaar would not let me post the exact ounces of pudding I used, when posting this recipe.