French Onion Sausage Rolls (Printable)

Flaky pastry rolls filled with savory pork and caramelized onions for a delicious French-British fusion appetizer.

# What You'll Need:

→ Onion Filling

01 - 2 large yellow onions, finely sliced
02 - 2 tablespoons unsalted butter
03 - 1 tablespoon olive oil
04 - 1 teaspoon granulated sugar
05 - 1/4 teaspoon kosher salt
06 - 1 teaspoon balsamic vinegar
07 - 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme

→ Sausage Rolls

08 - 1 pound pork sausage meat
09 - 1 teaspoon Dijon mustard
10 - 1 teaspoon fresh parsley, finely chopped
11 - 1 sheet all-butter puff pastry, about 14 ounces, thawed if frozen
12 - 1 large egg, lightly beaten
13 - freshly ground black pepper, to taste
14 - 1/4 cup grated Gruyère or Emmental cheese, optional

# Directions:

01 - In a large skillet over medium-low heat, melt unsalted butter with olive oil. Add finely sliced onions and cook gently, stirring frequently, for 15 to 18 minutes until softened and golden.
02 - Sprinkle in granulated sugar and kosher salt. Continue to cook onions, stirring regularly, for an additional 10 minutes until deeply caramelized. Stir in balsamic vinegar and thyme, cooking for 1 to 2 minutes more. Remove from heat and allow onion mixture to cool completely.
03 - In a mixing bowl, combine pork sausage meat, Dijon mustard, chopped parsley, freshly ground black pepper, and grated cheese if using. Fold in cooled onion mixture until just incorporated.
04 - Preheat oven to 400°F. Line a baking sheet with parchment paper. On a lightly floured surface, roll out puff pastry to a 12 x 10-inch rectangle. Cut pastry lengthwise into two strips. Place sausage filling in a log along one long edge of each strip.
05 - Brush the opposite long edge of the pastry strips with egg wash. Carefully roll pastry over filling, sealing edge firmly to enclose. Position rolls seam-side down. Slice each roll into 6 even pieces to yield 12 rolls.
06 - Arrange prepared rolls on the lined baking sheet. Brush tops with remaining egg wash and score lightly with a sharp knife for decorative effect.
07 - Bake in preheated oven for 25 to 30 minutes until pastry is golden, puffed, and fully cooked through. Allow to cool slightly before serving.

# Expert Tips:

01 -
  • The hidden layer of caramelized onions gives every bite a melt-in-your-mouth sweetness.
  • They’re perfect as bite-size snacks or an easy appetizer that always gets devoured first at gatherings.
02 -
  • If the onions aren’t fully cooled before mixing into the sausage, the pastry can turn soggy—learned this after my first rushed batch.
  • Brushing the pastry edges (not just the top) with egg wash gives a better seal and keeps the filling tucked inside.
03 -
  • If the pastry starts to feel sticky, pop it back in the fridge for five minutes and it’ll be easier to handle.
  • Use parchment paper so nothing sticks and cleanup stays easy.

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