Place the broccoli florets into a steamer; place the steamer into a large saucepan filled with 1 inch of water. Steam the broccoli for 5 minutes, or until crisp-tender.
Meanwhile, combine the olive oil, soy sauce, rice vinegar, and sugar in a small saucepan over medium heat.
Cook while whisking until the sugar has dissolved.
Place the steamed broccoli in the saucepan and gently stir until evenly coated.