3 sea leeks mustard sauce Recipes

olive oil, sliced leek (about 2 large), salt, black pepper, diagonally sliced belgian endive (about 3 heads ), garlic cloves, minced, dry white wine, clam juice, dijon mustard (such as delouis fils dijon), divided, dried marjoram, sea bass or grouper fillets

butter, leeks, trimmed and sliced, butter, extra, plain flour (all-purpose), milk, dark ale , such as stout, worcestershire sauce, hot english mustard, cheddar cheese, grated, egg yolks, sea salt and cracked black pepper, thick bread