Citrus & Fennel Salad

• 2 pink grapefruit
• 1 seedless oranges
• 1 head radicchio
• 220 gr fennel (fresh)
• 60 ml unsweetened orange juice
• 16 ml olive oil
• 2 gr orange rind (grated)
• 1 gr salt
• 1 gr pepper
• 1 gr fennel seeds (crushed)