Chirashi Bowls

Name: Chirashi Bowls
Prep time: 10 min
Total time: 10 min
Cuisine: Asian, Japanese
Ingredients: 1 1/2 c. sushi rice; 1 1/2 c. water; 1/4 c. unseasoned rice vinegar; 2 1/2 tbsp. granulated sugar; 1 tsp. kosher salt; 1 Persian cucumber, very thinly sliced; 1/4 tsp. kosher salt, plus more; 1 tbsp. unseasoned rice vinegar; 1 tsp. granulated sugar; 1/4 tsp. soy sauce; 1/4 tsp. toasted sesame oil; 1 large egg; Pinch of kosher salt; 1/2 tsp. vegetable oil; 1 sheet toasted nori; 1/4 lb. large shrimp (about 4), peeled and deveined; 1/3 lb. sushi-grade salmon; 1/3 lb. sushi-grade tuna; Black and white sesame seeds, for garnish; 1 avocado, sliced; 4 lemon slices; 2 oz. ikura (salmon roe); Wasabi and pickled ginger, for serving