HOMEMADE GARLIC SAUCE
This is the easiest of the two. Mash up as much garlic as you want, preferably in a mortar and pestle (or you can use a food processor), then mix it in with enough extra virgin olive oil to make a loose paste. Add lemon juice to taste and season with salt.
Restaurant (white) garlic sauce:
For this one you need to use a food processor or a blender.
½ cup peeled garlic
1 Tbsp Mayonaise (optional)
¼ - 1/3 cup Vegetable Oil
Lemon juice to taste
Process the garlic with the mayonnaise, if using (most restaurants use it but I do not like it too much) to a very fine paste. With the motor running slowly, add vegetable oil till you get the desired mayo-like consistency. Add Lemon juice and salt to taste.