Blend almonds or macadamia nuts, lemon juice, olive oil, garlic, salt and water in a food processor until smooth.
Add the walnuts or pecans, breadcrumbs, onion, bouillon, smoked paprika, soy sauce, black pepper, seitan and mushrooms and process until well combined. I like to leave some texture, but the consistency is up to you.
Set aside.
Preheat oven to 425 degrees F and line a baking sheet with parchment paper.
Remove your puff pastry from the fridge and roll out into a rectangle, cut in half so you have two triangles.
Spoon the filling lengthwise down the long side of the puff pastry triangle; lightly brush the border with the milk.
Roll the dough over the “sausage meat” and secure it with milk as glue.
Brush the top of the roll with milk and sprinkle with sesame seeds.
Place on parchment paper-lined baking sheet and cook in the oven for 10-15 minutes, or until golden brown.