3/4 cup of steamed rice
Hot green tea. Use green tea made from tea leaves. Genmai-cha, which has toasted brown rice in it, or Oolong tea would also work.
Toppings: basic ones are arare, tiny rice cracker pellets or crumbled rice crackers of another sort, and shredded nori seaweed. Optional: wasabi, pickled plum, salted salmon bits, mitsuba (a kind of herb), tiny semidried fish called jako, bonito flakes.