Prep time: It's about 5 min for mixing the dressing! (In addition there is the preparation of the lettuce leaves (trimming, cleaning ...) & the preparation of any further ingredients (like spring onions, tomatoes, cucumber, radishes, green beans, peas, carrots ... cheese, ham, eggs ...) - maybe 10-20 min.Oil: In general you may use any oil that you like & that seems to match w/ the salad & your preferences.Vinegar: In general you may use any vinegar ... (However, have in mind the acidity - adjust the amount if necessary!)Mustard: In general you may use ... (However, have in mind the intensity of the mustard - adjust the amount!)Sweet mustard: If you use sweet mustard you won't need any sugar or honey or whatever. If using another mustard don't forget to add some sugar or honey or ...