Braised Leeks Peas and Lettuce

Name: Braised Leeks, Peas, and Lettuce
Ingredients: 4 Tbsp. unsalted butter; 3 leeks, white and pale green parts only, thinly sliced, well rinsed; 1 tsp. kosher salt, plus more; 1/2 tsp. freshly ground black pepper, plus more; 1/4 cup dry white wine; 2 heads of Little Gem lettuce or romaine hearts, thinly sliced; 1 lb. frozen peas, thawed; 2 Tbsp. finely chopped chives; 2 Tbsp. finely chopped mint; 1 tsp. finely grated lemon zest; 1/4 cup roasted, salted pistachios, coarsely chopped