Steak Sandwich With Caramelised Onions

Steak sandwich with caramelised onions Preparation time: 15 minutes Cooking time: 15 minutes Serves: 4 Ingredients 1/3 cup low-fat mayonnaise 1 clove garlic, crushed Olive or canola oil spray 2 large red onions, peeled, halved and thinly sliced 1 teaspoon brown sugar 1 teaspoon balsamic vinegar Freshly ground black pepper, to taste 4 large thin field mushrooms, stalk …
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