Heston Blumenthal's smoky avocado beef burger recipe

Ingredients

• 1 tsp grapeseed oil
• 30 g shallots, finely diced
• 1 pinch smoked paprika
• 200 g avocado, cut in half, peeled and stone removed
• 20 g lemon juice
• 10 g sherry vinegar
• 130 g mayonnaise
• 35 g fresh jalapeños, cut into very small dice, deseeded
• 4 x 125g beef burgers
• 4 alder wood smoked bacon rashers (or similar)
• 4 burger buns, toasted
• 70 g pickled gherkins, sliced lengthways, to serve