Reddit mentions of Marukan Seasoned Rice Vinegar 12 Oz (12 oz), 12 oz

You just need nori sheets, rice vinegar (I used this one ), rice, and your choice of veggies.

• Cook 1 cup of rice and then combine with 2 tablespoons of the rice vinegar in a nonmetal bowl (I guess it can react to the vinegar, idk)
  
  
• I then put the rice in the freezer to cool because you want it to be cool or room temp when you are assembling the roll
  
  
• Chop all veggies into thin slices (about the size of a matchstick). I used avocado, carrot, and cucumber for the left roll, and cucumber and spinach for the right roll.
  
  
• To assemble, wet hands and press about 2/3 a cup of cooled rice on to the nori sheet, so that it covers about 3/4 of the entire sheet. Then add a line of veggies to the end of the roll, and roll it all up. When your roll reaches the side without any rice, take some water and use it to smooth down the edge so that it sticks to the rest of the roll.
  
  
• Cut into eight prices, and serve with soy sauce
  
  Sorry if any of that was confusing, it’s hard to explain but pretty easy to do once you get the hang of it!