Avocado
The Avocado Pear is used in California Rolls, (which are best rolled with the rice on the outside of
the Seaweed).
Don't be afraid of Avocado. Many people talk about the Avocado
as being full of fat and really bad for you. In fact, the Avocado is GREAT
food.
The fats in Avocado are good fats.. mono-unsaturated fats (like those in
Olive Oil) which raise the good HDL Cholesterol levels in the bloodstream,
which in turn help neutralize the harmful LDL Cholesterol in your blood.

Avocado has a wonderfully buttery texture and nutty, flavour. At their
best Avocados can taste vaguely 'oniony'.
In my opinion, the 'Haas' avocado has the best flavour, it's richer and
nuttier. They can be identified by their darker appearance (more purple than
green), plus their skin is much coarser and bumpy.
Choosing the right Avocado for Sushi is VERY important. There is nothing
worse than eating California rolls with under ripe, firm avocado. The ideal
texture is buttery. Don't be afraid to gently squeeze an Avocado in the palm
of your hand before you buy it, it should just 'give' a little.
The best Avocados I've found (in the UK) are from
Waitrose Supermarket,
it sells two-packs of "Ripe and Ready to Eat" Avocados.. although on
occasions I've found them over ripe, indicated by blackening inside the
flesh!!
Another important point: Its best to not to store the avocado in the
refrigerator for at least two hours before serving, it will be far too cold,
and firm in the mouth, and the taste is spoiled.