Step 1

Rinse rice in a fine-mesh sieve until water runs clear. Place in a medium saucepan; add ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt and 1¼ cups water. Stir well, then bring to a boil. Cover with a lid and reduce heat to lowest setting. Cook, undisturbed, 15 minutes. Remove from heat, uncover, and fluff rice with a fork.

Step 2

Meanwhile, slice an orange in half and finely grate in zest from 1 half into a large bowl. Squeeze juice from same half through a fine-mesh sieve into bowl; discard seeds (if using grapefruit, use 2 tsp. zest and 3 Tbsp. juice). Whisk in garlic, lime juice, 2 Tbsp. oil, and ½ tsp. mild chile flakes.

Step 3

Meanwhile, remove peel and white pith from remaining citrus; discard. Slice citrus into ¼”-thick rounds; set aside.

Step 4

Pat shrimp dry; season with salt. Heat 1 Tbsp. oil in a large nonstick skillet over medium. Cook shrimp, tossing occasionally, until bright pink and cooked through, about 3 minutes. Transfer to bowl with dressing; toss to coat.

Step 5

Heat remaining 1 Tbsp. oil in same pan over medium-high. Add rice; press into an even layer with a spoon. Cook, undisturbed, until light golden and crisp underneath, 6–8 minutes. Divide rice among plates, arranging crisped side up.

Step 6

Add avocado, onion, arugula, and reserved citrus rounds to bowl with shrimp and season with salt; toss well. Spoon over rice; drizzle any remaining dressing on top. Sprinkle mild chile flakes over.