Fish with Curried Cucumber Tomato Water and Tomato Herb Salad

Purée cucumber, tomato, curry powder, and salt in a blender until smooth, about 30 seconds. Line a fine-mesh sieve with a dampened paper towel and set over a large glass measure, then transfer cucumber mixture to sieve and let drain until liquid measures 2/3 cup, about 20 minutes. If liquid measures less than 2/3 cup, gently squeeze paper towel over sieve until liquid totals 2/3 cup. Discard solids and transfer liquid to a 2- to 3-quart saucepan. Boil cucumber tomato water until reduced to about 1/3 cup, then remove from heat and cool to room temperature, about 30 minutes.