Prix De France Steak Salad

• 1 garlic clove
• 1 head leaf lettuce (red)
• 1/2 chervil (dried)
• 650 gr cherry tomatoes
• 260 gr frank steak
• 160 gr mushrooms
• 120 gr onion (sliced red)
• 90 ml olive oil
• 30 ml lemon juice (fresh)
• 20 ml wine vinegar