- 1 cup white miso (also called shiro miso)
- 1/2 cup mirin (Japanese sweet rice wine)
- 1/2 cup sugar
- 1/4 cup water
- 1/2 cup mayonnaise
- 2 pounds tuna steak, cut into 1-inch cubes
- 8 (12-inch) wooden skewers, soaked in water 30 minutes
- zucchini and snow-pea salad
- Heat miso, mirin, sugar, and water in a small saucepan over medium heat, stirring, until sugar has dissolved. Remove from heat and whisk in mayonnaise, then cool to room temperature.
- Put tuna in a sealable bag (or nonreactive shallow dish). Pour marinade over tuna and marinate, chilled, at least 1 hour.
- Prepare grill for direct-heat cooking over hot charcoal (high heat for gas).
- Thread tuna onto skewers, leaving a small space between each piece. Put on a tray.
- Generously oil grill rack, then grill skewers, turning once, until just pink in center, about 4 minutes total. Let stand 5 minutes.