egg wash(1 large egg beaten with 1 tablespoon water)
1tablespoonraw sesame seeds
Instructions
Preheat oven to 400 degrees F. Line a baking sheet with parchment paper.
Caramelize onions. Heat oil in a medium saute pan over medium heat. Add sliced onion and saute until softened, about 7-8 minutes. Reduce heat to medium-low, season the onions with salt, and continue to cook until caramelized, about 30 minutes. Add balsamic vinegar, stirring to combine. Remove from heat and cool.
In the same pan, heat another tablespoon of oil. Add the mushrooms and saute until softened, about 3-4 minutes. Season with salt and thyme and continue to saute until all the moisture has evaporated, stirring frequently. Remove from heat and cool.
Lightly dust a clean work counter with flour. Roll out the puff pastry into a 10x12-inch rectangle. Cut the rectangle into 6 rectangles, about 5x4 inches. Place 1 ½ tablespoons of mushrooms in the center of each, followed by 1 tablespoon of caramelized onions and 2 tablespoons of fontina.
Shape 2 ounces of sausage into a small log that will fit on top of the fillings. Place on top of the fontina cheese.
Use a sharp knife to cut the pastry on both sides of the filling into ½ inch strips on a diagonal. Gently pull on the top and bottom of the pastry to fold over the sausage filling.
Take one strip and gently pull it across the filling towards the center. Take a strip from the other side and pull it towards the center to cross over the first strip. Repeat to create a crisscross pattern.
Brush the sausage rolls with egg wash and sprinkle with sesame seeds. Bake the rolls for 25-30 minutes or until golden brown. Let rest for 10 minutes before serving.
Notes
You can cook the caramelized onions and mushrooms the day before.