Heat the oil in a large skillet over high heat and brown the pork, stirring occasionally, for about 3 minutes. Stir in the onions, celery, bell pepper, salt, crushed red pepper, and black pepper. Cook for 2 minutes. Add the garlic and cook for 1 minute. Add the saffron and stir. Add the clams, wine, and cilantro. Cover the skillet and cook over high heat until all the clams are open, about 5 minutes. Remove from the heat.
To serve, divide the clams and broth among 4 shallow bowls, allowing about 6 clams for each serving, and serve with crusty bread. Garnish with fresh cilantro sprigs, if desired.