Eggs Benedict With Smoked Salmon

INGREDIENTS
- 4 Eggs
- 2 tbsp white wine vinegar
- 2 English muffins , halved
- a little butter , for spreading
- 8 slices smoked salmon
- chopped chives , to serve
FOR THE HOLLANDAISE SAUCE
- 2 tsp lemon juice
- 2 tsp white wine vinegar
- 3 egg yolks
- 125g