BBC Food - Recipes - Potato tart with mustard, leeks and mushrooms

Name: BBC Food - Recipes - Potato tart with mustard, leeks and mushrooms
Ingredients: 100g/4oz plain flour , plus extra for dusting; salt; freshly ground black pepper; 1 tsp English mustard powder; 75g/3oz chilled unsalted butter , diced; 100g/4oz leftover mashed potato; ½-1 tbsp iced water (optional); 2 tbsp olive oil; 400g/14oz leeks , trimmed and thinly sliced (225g/8oz trimmed weight); 100g/4oz chestnut mushrooms , brushed to remove any grit, sliced; 75g/3oz mascarpone; 1 tbsp wholegrain or Dijon mustard; 50g/2oz Cornish blue, Stilton or Gorgonzola (or a similar vegetarian blue cheese), diced; pinch crushed dried chilli es (optional); lightly dressed fresh green salad , to serve (optional)

git.macropus.org

Potato pastry is a wonderful way of using up leftover mashed potato, and this savoury tart is delicious hot or cold.

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Ingredients

100g/4oz plain flour , plus extra for dusting
salt
freshly ground black pepper
1 tsp English mustard powder
75g/3oz chilled unsalted butter , diced
100g/4oz leftover mashed potato
½-1 tbsp iced water (optional)
2 tbsp olive oil
400g/14oz leeks , trimmed and thinly sliced (225g/8oz trimmed weight)
100g/4oz chestnut mushrooms , brushed to remove any grit, sliced
75g/3oz mascarpone
1 tbsp wholegrain or Dijon mustard
50g/2oz Cornish blue, Stilton or Gorgonzola (or a similar vegetarian blue cheese), diced
pinch crushed dried chilli es (optional)
lightly dressed fresh green salad , to serve (optional)