Start this recipes by frying together the onion and garlic in a little oil to sweat. Tip into a mixing bowl with the minced beef and sausage meat and mix together. Next, add in the cooked onion and garlic, yeast extract, 1/2 beaten egg, breadcrumbs, parsley and grated smoked cheese and mix well. Lay out 2 large pieces of cling film and lay half the filling down the middle. Place the hard eggs on top and cover with the remaining filling. Wrap up in the cling film like a sausage and chill in the fridge. Meanwhile, sauté the mushrooms in a pan for 3 minutes and drain away any water. Roll out the puff pastry to a large rectangle and brush with the remaining ½ beaten egg. Spoon the mushrooms down the middle then place the prepared meat sausage on top. Wrap up in the puff pastry and cut off any excess. Brush with water or any extra egg and sprinkle over the seeds. Bake in the oven at 190°C for 45-55 minutes, or until gold brown and cooked through. Serve cut into slices with roasted vegetables on the side.