Sweet potato & ginger soup with harissa croutons

Ingredients 2 sweet potatoes, 1/2 pint vegetable stock, 1/2 tsp cumin, 1/2 tsp coriander, 1 white onion, 2 cloves garlic, Croutons: bread, rapeseed oil smoked chillis, garlic salt, paprika, mint, rose petals, cumin, caraway seeds, basil oil, bell pepper, Rachel's Organic Greek Yoghurt.

Serves: 3 preparation: 1 hour

This soup is nothing short of magnificent. Rich, warming and comforting with a velvet thick texture - this goes perfectly with the spicy croutons and cool dollop of yoghurt

1) Roast the sweet potatoes in the oven for 30 minutes at 200 degrees.

2) Peel and finely dice the onion and sautee in a little rapeseed oil. Add the coriander and cumin.

3) Peel the skin from the potato and stir the flesh into the spiced onions.

4) Add the vegetable stock and mash the potato into it. Leave to simmer for 30 minutes, then parse through a sieve, to leave a smooth soup. Top with a dollop of yoghurt and the croutons.

To make the croutons:

1) Remove the core and seeds from the bell pepper, then roast until the skin is almost completely blackened. Allow it to cool, then peel off the charred skin carefully.

2) Blitz the dried, smoked chilli in a blender, then add to a mortar and pestle and grind into a relatively fine dry paste. The ratio of spices is relatively simple for my recipe, though of course you can adjust for taste. Add 1 tsp garlic salt, 1 tsp paprika, 1 tsp cumin, 1 tsp caraway seeds and grind into the chilli. Add a teaspoon of basil oil.

3) Add the bell pepper, 2 or 3 mint leaves and the rose petals (about half the petals from a single red rose) into a blender and pulse.

4) Stir the rose, mint and pepper mixture into the spice and oil paste - now you have harissa!

5) Spread a thin layer of harissa onto a slice of bread, then cut into squares. Fry off in a drizzle of rapeseed oil until crisp.