in a mortar & pestle, pound corriander seed powder, Thai pepper powder and garlic into a paste. In a medium-sized pot, heat vegetable oil over medium heat, then saute the garlic paste mixture. Add ground pork. After the pork starts to cook, add fish sauce and the water used to soak shiitake mushrooms. Drain bean thread noodles, and add to the pot. Add shiitake mushrooms, cabbage, and toss together for a few minutes. Pour in the soup stock. Cover and let it boil.