Prawn Cocktail Po' Boy Crostini

Ingredients

• 300g raw king prawns
• 2 eggs, beaten
• 1/2 cup flour
• 1 cup fine cornmeal
• 1 tsp garlic powder
• 1 tsp cayenne
• 1/2 tsp smoked paprika
• Vegetable oil, for frying
• 6 tbsp mayo
• 3 tbsp ketchup
• 1 tsp Worcestershire sauce
• 1 tbsp horseradish cream
• 1/2 tsp cayenne, or to taste
• 1 tsp wholegrain mustard
• 1 tbsp chives, finely chopped
• 1/2 shallot, finely diced
• Salt, to taste
• 1 baguette, sliced
• Lettuce
• Tomato slices
• Chives
• Olive oil