I like making my own salad dressings. Especially when I have delicious lettuce & spinach I have grown myself. I think it tastes better. Here is a simple one you can make using ingredients you already have. You can modify it to suit your taste.
1/4 cups freshly squeezed lemon juice (About 2-3 lemons worth)
3/4 to 1 cup of extra virgin olive oil
1 tablespoon grated parmesan cheese
1 tablespoon garlic (powdered or minced)
1/4 teaspoon salt
1/2 teaspoon pepper
Put all ingredients in mason jar, cover with lid tightly and shake well to combine. Will keep fresh in fridge for up to a week. Enjoy!