Why is it called XO sauce?

Related questions

1. What does XO mean in food?
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5. Does McDonalds have Szechuan sauce?
6. What does McDonald's Szechuan sauce taste like?
7. How much did Szechuan sauce sell for?
8. What does XO stand for?
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Tags

1. #history
2. #scallops
3. #onions
4. #peppers
5. #chopped
6. #garlic
7. #developed
8. #cuisine
9. #which
10. #including
11. #1980s
12. #cooked
13. #shrimp
14. #chili
15. #conpoy
16. #dried
17. #cantonese
18. #sauce
19. #roughly
20. #seafoods