The Best Homemade Gravy

Name: The Best Homemade Gravy
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 4 cups broth or stock, preferably low-sodium (see note for how to use drippings); 10 tablespoons butter; 2/3 cup all-purpose flour (don't pack the flour into the cup - should be right around 10 tablespoons); 1 tablespoon bouillon paste (optional - see note); Salt and pepper to taste