Seared shrimp perched atop a bed of steamed asparagus and dressed in light garlic sauce. Fried flounder embellished with black bean, ginger, and mushroom sauce. Tender beef over spaghetti with basil, sweet pepper, tomatoes, and a spicy chili-garlic sauce. At Thai Pavilion, it's the sauces and seasonings that turn otherwise simple dishes into delicious house specialties. This National Harbor restaurant…