These are a couple of recipes that I've made for years, because the taste is so close to the store variety. You can vary the flavor of the sauces by changing the ratio of ingredients, but these are the ingredients I like.
TARTAR SAUCE FOR FISH
1/3 cup Miracle Whip salad dressing
1 Tbs hamburger relish
1 tsp onion, finely chopped...
OR...1/2 tsp onion powder
1/2 tsp lemon juice
Mix all ingredients together, and serve. Keeps in fridge for at least a week.
TANGY SAUCE FOR SEAFOOD
1/2 cup Ketchup
1 tsp minced horseradish
1/2-1 tsp lemon juice
dash Worcestershire sauce
Mix all together, adding horseradish to increase level of heat desired. Keep cold and serve cold. Great for dipping pre-cooked shrimp from shrimp rings. It's also good on cold left-over fish for lunch. Keeps well in the fridge.