
To add an avocado as a topping to your sushi roll, you need to cut a avocado like shown in the photo. You will need about a third of the avocado, although you can use half if you like. Make sure your avocado is ripen, else it won't flatten as nicely to the roll.
To prepare the avocado, use a knife, and cut 1/3 from the avocado as shown. 
 
 Then, 
cut the peel away from the avocado as shown in this photo. Now  you have  your topping for the roll.

You can also trim the sides of the avocado, to make it more evenly squarish looking as shown in the photo.

Next, slice the avocado thinly as shown

Then put all the slices on top of the roll, using a knife or with your hands.

Cover the avocado with saran wrap, should cover the roll as well.

Use the bamboo mat to firm and flatten the avocado to the roll.

Remove the saran wrap slowly.
Add additional topping like sesame seeds, sauces, as per the roll your making.
FYI
You can add the avocado topping after you cut the roll or before you cut the roll, however, i have found it easier for some rolls, to add the avocado after cutting the roll.
Before adding the avocado, use the bamboo mat, and cover the roll in saran wrap. then firm the roll. 
Cut the roll with the saran wrap on the roll.
How To Cut a Sushi Roll gohere
Remove the wrap, then add your avocado topping. Add another 
saran wrap, and firm the roll again.  This will flatten the avocado to the roll, giving it a nicer look.
To cut the roll after you've added the avocado, leave the saran wrap on once you've firmed the roll, as this will keep the avocado intact and keep  your hands from sticking to the 
rice as you cut the roll.
 
 
ALSO READ:
How To Cut An Avocado
 
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