I use both store bought salad dressings and ones that I make myself. I do like tahini and the jar does last a long time in the fridge. Tahini can be used in a variety of ways including as part of a marinade and for making hummus. If you don't have tahini, you can substitute it with almond butter.
2 tbsp oil - olive oil or canola
4 tbsp tahini
3 tbsp lemon juice
1/3 cup water
1 to 2 tbsp tamari sauce (use soy sauce if you don't have tamari)
1 tbsp red onion or green onion, finely chopped
1 garlic clove, minced
1 tbsp maple syrup
Combine all of the ingredients in a jar with a tight lid and shake well OR use a small food processor and mix the ingredients in the food processor. Refrigerate for at least 10 minutes before using. You can adjust the recipe by adding more tahini, lemon juice, tamari or water. Store in the fridge.
Adapted from food.com