Chilled corn soup with prawns, avocado and tomato relish

This is the season for gorgeous chilled soups, whether you serve them in shooter glasses or bowls like this picture. I will be posting several of these over the next few summer months, as I love starting a meal with a refreshing and zingy flavor.  You can make them well in advance so they are ideal for dinner parties or spontaneous lunches. Recently we held a house concert here at our home and I made my chilled cucumber soup (also on this blog) and set out 40 shooter glasses and two large pitchers of the soup. There was a constant group hovering over the pitchers refilling their glasses.

Serves 4
1 tbsp coconut oil
2 large leeks, thinly sliced (white and light green parts only)
3 ears corn, husked, silk removed
3 cups chicken broth
1 avocado, pitted, peeled and diced
6 oz grape tomatoes, quartered lengthwise
8 to 10 leaves fresh, thinly-sliced basil
8 oz small or medium prawns, peeled and de-veined, tails removed
1/4 tsp sea salt
1/8 tsp Fresh ground black pepper
2 tbsp fresh lime juice

In a large saucepan on low, heat oil until melted. Add the leeks and cook, stirring occasionally, for about 8 minutes or until softened.
Meanwhile, over a large bowl, cut the corn kernels from the corn cobs (A sharp, serrated knife would work well). With a heavy knife, cut each cob into 2 to 3 pieces.
Add the corn kernels and pieces of cob to the pot with the leeks. Add the chicken broth and 1 cup of water, and increase the heat to high. Once boiling, reduce heat to low, cover and simmer for 25 minutes.
Remove the pot from heat and discard the cobs. Let cool for 10 to 15 minutes, then purée soup with an immersion blender. (Alternatively, carefully purée soup in batches in a food processor or blender.) Transfer to a large bowl, cover and chill for at least 4 hours, or overnight.
In a small bowl, toss avocado, tomatoes and basil
Heat a nonstick skillet on medium. Season the prawns with salt and pepper, add to the skillet and cook for 3-4 minutes, turning once, until just opaque.
Just before serving, chop the prawns coarsely and stir the lime juice into chilled soup. Ladle into bowls and garnish with avocado-tomato mixture and prawns, dividing evenly.