Snail rolls with tuna

Ingredients for a tuna puff pastry snail to serve as an appetizer for example, or as a starter or as a main course with a green salad. A puff pastry, a can of tuna, fresh parsley or coriander, a chopped onion, chopped dried tomatoes, salt pepper, 200 g of St Moret style cheese, a whole egg plus a yolk for gilding and seeds sesame rolled your puff pastry and cut it in half but you're both half-moon end to end by slightly overlapping them. Chop the tomato, onion and parsley and mix with the egg cheese, salt and pepper. Place the dough on the puff pastry all the way, leaving 1 cm or two ends. How is it not to roll by the right part and to roll to make a pudding. Then roll the pudding on itself to make a snail. Place on the baking sheet brush with egg yolk, sprinkled with sesame seeds and bake in preheated oven at 180 for 40 minutes.