Cornets salés farcies au fruits de mer (seafood stuffed cones)

Ingredients

• 1 kg of puff pastry (probably 2 packages)
• 1 can of tuna (in water or olive oil) drained
• 1/3 cup fromage blanc
• 2 tablespoon of mayo
• 2 tablespoon of red onion, finely chopped (about half of a small onion)
• 1 teaspoon vinegar
• 1 tablespoon of very finely chopped capers
• 150g shrimps (steamed or boiled) then chopped roughly
• 2 eggs, hard boiled then peeled and chopped
• about 6 green olives, pitted and roughly chopped
• 1 tablespoon of finely parsely
• 150g crab meat, forked
• 1/2 can of mussels, chopped
• egg + water for egg wash
• Nigella seeds (or sesame seeds)
• Whole or sliced olives (decor)