Classic beef burgers (MEATER+®)

Name: Classic beef burgers (MEATER+®)
Prep time: 15 min
Total time: 15 min
Yield: 4 porties
Cuisine: Belgian
Ingredients: brown onion; fresh flat-leaf parsley; extra virgin olive oil; beef chuck steak; breadcrumbs; egg yolks; Dijon mustard; salt; ground black pepper; round bread rolls