Asian Garlic Noodles

Name: Asian Garlic Noodles
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Asian
Ingredients: 1/4 cup sesame oil; 1 pound shiitake or baby Bella mushrooms, sliced; 1 large red bell pepper, sliced into matchsticks; 9 cloves garlic, minced or pressed; 2 1/2 cups garlic broth or chicken broth; 1 pound spaghetti; 2 tablespoons (1/4 stick) salted butter; 2 teaspoons dried tarragon; 1/4 cup oyster sauce; 1/4 cup hoisin sauce; 1 tablespoon low-sodium soy sauce; 1 tablespoon ginger, minced or pressed; 2 teaspoons chili-garlic sauce of sriracha; 1 bunch scallions, sliced, a handful reserved for garnish; 2 tablespoons sesame seeds, plus more for garnish