How to Make It
In a mini processor, puree the nuts, shallots, garlic, chiles, lemongrass, ginger, lime juice and sugar. Transfer the paste to a bowl and stir in the coconut milk, pepper and 1/2 teaspoon of salt. Add the shrimp and turn to coat with the marinade. Cover and refrigerate for at least 4 hours or overnight.
In a nonstick skillet, heat the oil. Add the shrimp and season with salt. Cook over moderately high heat until the shrimp are golden and just cooked through, 3 minutes. Spread each toast with crème fraîche and top with a shrimp. Garnish with cilantro and serve.