Peel and coarsely shred the 16. 0 oz (454 g) of cucumbers, then place them in a mixing bowl.
Sprinkle the shredded cucumber with 0. 5 tbsp (0. 25 oz / 7 g) salt and toss thoroughly.
Let the cucumbers sit at room temperature for 20 to 30 minutes to draw out excess moisture.
Pour the cucumbers into a fine mesh strainer, firmly press out the accumulated liquid, and then gently pat them dry with paper towels to ensure your final dish isn't watery.
Place the 1. 5 cups (12. 7 oz / 360 g) of plain yogurt, 0. 25 tsp (0. 04 oz / 1 g) cayenne pepper, 1. 0 tsp (0. 07 oz / 2 g) citrus zest, and 2. 0 tbsp (0. 1 oz / 3 g) fresh mint in a 1-quart bowl.
Whisk vigorously with a fork until the mixture is completely smooth and creamy, then stir in the dried shredded cucumbers.
In a small pan, heat the 2. 0 tbsp (1. 0 oz / 28 g) avocado oil over moderate heat.
When the oil is hot but not smoking, carefully add the 1. 0 tsp (0. 1 oz / 3 g) black mustard seeds.
Fry just until the seeds sputter and turn gray (use a spatter screen if necessary to prevent popping). Carefully pour the hot fried seeds and oil directly into the cucumber-yogurt mixture, stirring well to blend all the flavors.
Refrigerate the mixture for 1 to 2 hours, which allows the fresh mint and toasted seasonings to fully release and meld their flavors into the yogurt.
Serve chilled, garnished with beautifully twisted cucumber flowers and a light dusting of paprika.