Summary

Ingredients

• 3 large onion (s), red
• 200 ml port wine
• 100 ml soy sauce
• 60 ml olive oil
• 25 ml balsamic vinegar, dark
• 2 tablespoon sugar, brown
• some pepper

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Instructions

1. Peel the onions and cut into thin slices. Mix the remaining ingredients together well and leave the onions and garlic to marinate for a good two hours. Then put the entire mixture in a pan and reduce over medium heat until a syrupy consistency is achieved.
2. Is perfect for hamburgers. Sauces are then actually no longer necessary. Can also be wonderfully produced in larger quantities and frozen in advance.