01 -
Preheat your oven to 200°C/180°C(fan)/400°F/Gas 6
02 -
Add potatoes to a pan of boiling water. Return to the boil and simmer until tender, about 4-5 minutes
03 -
Meanwhile, heat a pan and melt butter. Add onion. Cook over a low heat until softened, about 5 minutes
04 -
Drain the potatoes and leave to steam dry for a few minutes. Mash the potatoes
05 -
Add cheddar cheese, cooked onions, gherkins and English mustard to the mashed potato. Mix well to combine everything
06 -
Slice puff pastry lengthways in half. Divide the potato mixture along the two pieces of pastry
07 -
Roll the pastry around the mixture. Repeat with the second roll and carefully turn the rolls over so they are seam side down
08 -
Slice each roll into eight pieces. Brush with whisked egg and sprinkle over the chia seeds
09 -
Arrange the rolls on a lined baking tray with space in between them. Bake in the oven for 25 minutes