Ginger Scallion Noodles

Name: Ginger Scallion Noodles
Ingredients: Kosher salt; 400 grams (14 ounces) dry ramen noodles or soba noodles (or 600 grams/1 1/3 pound fresh ramen noodles); 1 teaspoon canola oil; 5 green onions, roughly chopped; 2 garlic cloves, roughly chopped; One 3-centimeter (1 1/2-inch) piece of ginger, minced; 1/2 teaspoon crushed red pepper flakes, plus more for serving; 3 tablespoons (42 grams) butter; 2 handfuls baby spinach; 3 to 5 tablespoons (45 to 75 milliliters) soy sauce, divided; 1 lime, juiced; 1 large handful enoki mushrooms; White and black sesame seeds, toasted