Salmon With Dijon Dill Shallot Sauce

Name: Salmon With Dijon Dill Shallot Sauce
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Cuisine: European, Mediterranean, French
Ingredients: 1 1/2 lbs salmon fillets; 1/2 teaspoon salt, divided; 1 tablespoon olive oil; 3 tablespoons cold butter (divided); 1 small shallot, finely chopped; 1/2 cup white wine; 1 tablespoon Dijon mustard; 2 tablespoons roughly chopped fresh dill; 1/8 teaspoon black pepper; 1 cucumber, thinly sliced (for garnish); fresh dill sprig (for garnish)