You’d think cold soup might catch on and be more popular in a hot climate. I like hot soup, even when it’s hot out, but it just seems like a “mismatch”.
The leek and potato goes either hot or cold. Ate it hot the night I made it but it was better with more flavor cold the next day. The British drank hot tea in India, swore it cooled them down.
Some years ago my dad took me to a fancy place on a fishing trip, and he ordered for me. Fantastic.
As a adult with a wife I always made it for a dinner party or something similar. My recipe, which varies from the original, and for many people
No measurements......just the way I cook
6-8 med to large potatoes, cubed and boiled to softness
One or two large onions, chopped and boiled with potatoes
A BUNCH, like lots, of green onions chopped and boiled with potatoes
A pound of bacon, chopped and boiled with potatoes
A stick (or two) of butter
A med size container sour cream
Do not pour out the excess water, boil it down where there isn't much extra over the potatoes. ThIs is the best part of the soup so don't throw it out
Next step, in phases, due to volume. First four ingredients, food processor together, until its like baby food blended. Add butter and sour cream as you go. And the water from cooking. If it seems to liquidy, add some flour to thicken, while blending.
Everything back in the big pot. Refrigerate over night. Serve cold the next day. Will need to stir before serving. Salt to taste.
Simple and delicious. 
