Seared Halibut Niçoise

Ingredients

• 1 tablespoon dijon mustard
• splash of red wine vinegar
• salt and pepper, to taste
• 2 tablespoon olive oil
• 1 halibut steak, removed from bone and cut into four 4-ounce portions
• 1/4 pound haricots verts, stems removed
• 1 tablespoon olive oil
• 2 ounce cherry tomatoes
• 1 tablespoon cured black olives, roughly chopped
• 1 lemon