Heat oil in a large pot over medium heat. Add onion and cook, stirring occasionally, until soft, about 3 minutes. Add the collards, garlic and 1/2 teaspoon salt; cook, stirring, until bright green, about 2 minutes. Add hot sauce to taste, Worcestershire, cumin, paprika and pepper; continue to cook until the greens are completely wilted, 2 to 4 minutes more. Transfer the mixture to a large bowl and let cool slightly, stirring occasionally, about 15 minutes.