Found this recipe on detoxinista.com
3 to 4 Servings
1/4 cup fresh Lemon Juice - about 1 1/2 lemons
2 TB Apple Cider Vinegar
1 tsp Dijon Mustard
1/2 tsp Sea Salt
1/2 tsp Black Pepper
3/4 tsp Garlic Powder
Fresh Oregano, finely chopped to taste, start with 1/2 tsp
1/4 cup Extra Virgin Olive Oil
Combine everything, except for the olive oil, in a mini-food processor or blender, and blend until thoroughly combined. Add in olive oil and blend until emulsified. Store in the fridge for up to a week.