1. Cook bacon until crisp; remove witha slotted spoon to paper towels to drain.
2. Reserve 3 tablespoons of the drippins. Cut or tear endive from center stalk. Discard the stalks.
3. In a large saucepan, bring water and 1 1/2 teaspoons of salt to a boil. Add endive; cover and cook for 3 minutes. Drain.
4. Stir in bacon, reserved drippings, vinegar, onion, pepper and remaining salt. Mix well and serve immediately.