Next level potato salad - Good Food Middle East

Ingredients

• 800g Jersey Royals, Charlotte or Anya potatoes, or another waxy variety
• 2 tsp wholegrain mustard
• 2 tbsp muscatel or white wine vinegar
• 4 tbsp olive oil
• 1 shallot, very finely chopped
• 3 tbsp mayonnaise
• 2 tbsp soured cream
• 1 tbsp horseradish sauce
• ¼ lemon, juiced
• 2 spring onions, finely sliced
• handful of crispy fried onions