Charred New Potato And Fennel Salad

• 400 degree oven until just tender
• 6 from hea turn on broiler (inches)
• 2 fennel bulbs
• 1/2 dice
• 575 gr potatoes (red)
• 100 ml wine vinegar (red)
• 120 ml tasting olive oil (light)
• 60 ml olive oil
• 45 gr pitted nicoise olives
• 40 gr green onions