A simple sandwich for lazy blokes.
¼cup (60ml) olive oil
2 large onions, finely sliced
2 tablespoons balsamic vinegar
4 minute steaks, such as sirloin, fillet, blade or round
8 thick slices ciabatta or sourdough bread
½ cup (150g) dijonnaise or mayonnaise
2 cups baby rocket
4 tomatoes, sliced
