Bruschetta with smoked fish, pickled cucumber and currants

Ingredients

• 1/4 cup white wine or fruity vinegar
• 1/4 cup water
• 2 tablespoons caster sugar
• 1 onion, thinly sliced
• 1 small Lebanese cucumber, thinly sliced
• pinch of sea salt
• 1/2 baguette, thickly sliced
• 2 tablespoons olive oil
• 1/4 cup currants, covered in orange juice and a splash of boiling water
• 300-400g fresh smoked fish, broken into chunks