Madison Avenue Potato Salad

• 1/4 pimiento (diced)
• 100 gr thinly celery (sliced)
• 80 ml mayonnaise
• 65 gr quartered ripe olives
• 45 ml vegetable oil
• 38 gr dill pickles (diced)
• 16 ml wine vinegar
• 16 ml mustard
• 4 gr salt
• 2 gr onion (grated)