( SERVES 4 )
|1 tsp||Brown sugar|
|½ Tbsp||Olive oil|
|8 slices||Sourdough bread|
|4||Sirloin steaks, (cut 1cm thick)|
|2 handfuls||Salad greens|
- Peel, halve and slice the onions. Heat 1 Tbs olive oil in a saucepan, add the onions, balsamic, brown sugar and rosemary. Stir over a medium heat to coat then cover and let cook while stirring occasionally, for 20 minutes or until soft and caramelised.
- To make the bearnaise; Melt the butter gently and allow to cool slightly. Put the vinegar, shallot and half of the fresh tarragon(1 tbsp) into a small saucepan with a pinch of white pepper and the water. Reduce until 1½ tablespoons of liquid remain. Transfer to a bowl that fits over a saucepan half filled with hot water. Add egg yolks and whisk over the heat until thick. Whisk in a little butter at a time. When you have a creamy sauce, add the extra tarragon and lemon juice to taste. Season with salt and more white pepper if desired.
- Brush the slices of bread lightly with oil and grill until lightly toasted. Season the steak and grill for one minute on each side.
- Assemble the sandwiches by putting one slice of toasted bread on each plate. Top with greens, tomato slices, steak and then the onions. Spoon over the bearnaise and top with the second slice of grilled bread.