Step 1

When ready to cook, set the Traeger temperature to 350°F and preheat with the lid closed for 15 minutes.

Step 2

Pour the beer into a large saucepan. Add the onions and butter. Bring to a simmer on the stovetop over medium-high heat.

Step 3

Place a deep disposable aluminum foil pan on one side of the grill grates. Carefully pour the beer and onions from the saucepan into the pan on the grill.

Step 4

Arrange the brats on the other side of the grill grates. Close the lid and grill the brats, turning frequently with tongs, until cooked through, 20 to 25 minutes.

Step 5

Transfer the brats to the beer mixture and cover the pan tightly with aluminum foil. Let the brats simmer until the onions are tender, 45-60 minutes.

Step 6

Butter the cut sides of the buns, then place on the grill grates and toast until golden brown.

Step 7

To serve, lift a brat out of the beer mixture and place in a bun. Top with the stewed onions and mustard. Enjoy!