3Tblsneutral oil (such as grapeseed) plus more as needed
Instructions
In a large nonstick skillet with a lid, stir together 2 cups water, the rice, 1 tablespoon rice vinegar, the sugar and 1 teaspoon salt. Bring to a boil over high heat, then cover, reduce heat to low and cook until rice is tender, 18 to 20 minutes.
Meanwhile, thinly slice the scallions and cucumbers. In a large bowl, stir together the scallions, tuna, mayonnaise, Sriracha, soy sauce and remaining 2 teaspoons rice vinegar. Taste and add more Sriracha for more heat. Refrigerate until the rice is ready (or up to 5 days).
Sprinkle the cucumbers with a pinch of salt (or do as I did and marinate in a mixture of rice vinegar, soy sauce and sesame oil).
Now crisp the rice: Make 4 or 5 small holes in the rice in the skillet, then pour the oil down the sides of the pan and into the divots. Increase heat to medium and cook until the rice is browned at the edges, 4 to 7 minutes. (You can lift the rice to check.) If you don’t see oil bubbling in the holes, add a teaspoon or two more oil. You want the rice to develop a nicely browned crust.
Divide the rice, crispy side up, among bowls or plates and serve with a scoop of the spicy tuna and the cucumbers.