Roasted roots - Good Food Middle East

Ingredients

• 1½ kg floury potatoes, such as Maris Piper or King Edward, peeled and chopped into large chunks
• 1 celeriac, chopped into large chunks
• 3 large carrots, peeled and chopped into very large chunks
• 3 parsnips, peeled and chopped into large chunks
• 2 tbsp plain flour
• goose fat, from the goose