Heat 2 tablespoons olive oil in large pan over medium-high to high heat, add shrimp and sear 2 minutes, then turn, season with salt and pepper, cook a minute more, and remove from pan. Add another turn of oil and the minced celery, shallots and garlic, stir a minute or 2, then add chili paste and stir, add vermouth and let it absorb, add stock and let it bubble and reduce a minute, then add butter and parsley. Swirl, then add shrimp back to pan and turn to coat. Cook shrimp through 2 minutes more and douse with lemon juice, then serve.