Pan-Seared Halibut with Wilted Bitter Salad

Name: Pan-Seared Halibut with Wilted Bitter Salad
Cook time: 1 h
Total time: 1 h
Cuisine: European, Mediterranean, French
Ingredients: 1 small head radicchio (6 ounces); 1 head Belgian endive (4 ounces); 2 ounces (2 cups) baby arugula; 1 small fennel bulb; 4 (6- to 8-ounce) skinless halibut fillets , 1 inch thick; ½ teaspoon table salt; ¼ teaspoon pepper; 7 tablespoons extra-virgin olive oil , divided, plus extra for drizzling; 1 large shallot , minced; 3 garlic cloves , minced; ¾ cup dry white wine; ⅔ cup plus 1½ teaspoons lemon juice (4 lemons); 3 tablespoons water; 2 tablespoons Dijon mustard; ½ teaspoon flake sea salt