In a large stockpot or dutch oven, heat the seseme oil over medium heat.
Divide the bok choy into the white hard ends and the leafy greens. Put just the white ends into the pan with the carrots. Saute for 5 minutes or until tender.
Add the mushrooms and saute for anothe 3-5 minutes.
Add the garlic and ginger and saute for just 30 seconds, being careful not to burn it.
Add the seafood stock, Asian fish sauce, soy sauce, and Thai chili sauce. The Thai chili sauce is what makes it spicy, so add more if desired.
Raise the heat to high and bring the pot to a boil. Then reduce to a simmer for about 5-10 minutes.
Add the shrimp at the end and cook just for a few minutes until opaque and pink.
Putn seving bowls and garnish with fesh cilantro and lime.