dungeness crab bisque w/roast pepper crème fraîche

Ingredients

• 1 tablespoon butter
• 1 1/2 pounds dungeness crab, broken into small chunks
• 1/2 cup chopped onion
• 1 cup chopped celery
• 1 cup chopped carrot
• 1/2 cup chopped tomato
• 1 tablespoon chopped garlic
• 2 tablespoons tomato paste
• 1/2 cup white wine
• 24 ounces fish stock
• 1 teaspoon dried thyme
• 1 tablespoon paprika
• 1/8 teaspoon cayenne (or to taste)
• 1 stalk lemongrass
• 2 medium kafir lime leaves
• 1 cup heavy cream
• 1 pinch salt
• 1 pinch black pepper
• RED PEPPER CREME FRAICHE:
• 1 medium roasted poblano pepper, seeded and pureed
• 1/2 medium roasted red (or yellow) pepper, seeded and pureed
• 1 cup creme fraiche (or sour cream)