My 'sweet tattie & roasted garlic with stuff' soup recipie:
Some sweet tatties - 3 or 4, depends on size.
2 whole garlic wrapped in foil and roasted for 10 mins (200 degrees on my oven)
3 red chillis - I'm hardcore so with seeds.
Tablespoon ground corriander seeds
teaspoon cumin
Bit of allspice
Some ginger - 2-3cm in size I guess
1 big onion - chopped.
1 big courgette - peeled & grated
1 big carrot - peeled and grated
1 litre chicken stock - I cheat and use knor.
Bit of oil - half a tablespoon if that.
Wrap garlic in foil (cut the tops off first) and roast for 10 mins - leave til cool enough to handle.
Heat oil and add onion, grated carrot & courgette, heat for 5 mins.
Add chilli, ginger, coriander seeds, cumin, allspice and heat for 4 mins.
Add chicken stock & sweet tatties, simmer sweet tatties to cook in stock until soft.
Squeeze pulp of garlic in to soup.
Blitz until nice & thick.
I know you said your mate doesn't like spicey but ^^^ this started out as just sweet tattie & garlic soup that I found in my soup book so you can just remove the spicey element as I only added as I felt the soup needed 'more of something'.