Prepare your bamboo sushi mat: Cover your bamboo sushi mat with plastic wrap. This will help keep the rice from sticking to it.
Cut the cucumber: Cut the cucumber into strips that are as long as your nori sheet and about 1/8 inch thick.
Press rice onto nori sheets: Next, place the nori sheet onto the plastic wrap with the shiny side facing down. Then press around 1 cup of rice onto the nori sheet in an even layer. Tip: Wet your hands prior to handling the sushi rice. This will prevent the rice from sticking to your hands.
Flip nori sheet: Flip the nori sheet so the rice is facing down.
Add sweet mango sauce: Add a thin line of sweet mango sauce to the roll prior to adding the other fillings.
Cut the avocado: Slice the avocado in half the long way. Remove the seed and cut each half into 6 slices. The whole avocado should yield around 12 slices. I often cut the slices right out of the avocado half and add directly to the roll to ensure freshness. You can also drizzle lemon juice over your cut avocado to prevent it from browning in your roll.
Add the avocado and cucumber: Add the avocado slices and cucumber sticks horizontally along the nori sheet. In general, I add 2-3 avocado slices and 1-2 cucumber sticks depending on the size of each ingredient and how everything fits.
Add the shrimp: Add two pieces of shrimp to the middle of the roll with the tails sticking out of each end.
Roll the sushi: Use the bamboo sushi mat to fold your roll until it's completely enclosed. Once the rice is making contact with the nori sheet, pull back the sushi mat so it doesn't get caught in the roll. Still using the sushi mat as your guide, finish rolling until it's completely wrapped. Then wrap the sushi mat around the roll and gently tighten the roll together. Keep in mind that rolling sushi is an art that may take some practice so don’t get frustrated if it doesn’t look perfect your first time. It will get easier the more you do it. Cut the mango and add to the roll: The remaining mango needs to be peeled and cut into fourths. Each fourth then needs to be sliced thinly and added to the top of each roll. To do this, I start by pealing the entire mango and cutting into four sections around the core. I then cut each fourth into thin slices going the short way. Cut the slices as thin as you can or around 1-2 millimeters thick. Once cut, use your hand to gently push the mango slices to the side so they fold over on top of each other. Then place all the slices of one fourth of the mango on top of your roll. Tip: It helps to use a ripe mango for this step as it will be softer and form to the sushi roll better. Use the bamboo sushi mat to press the mango slices onto the roll: Since the mango slices have a tendency to move around, I would suggest covering the roll in plastic first. Then wrap the sushi mat around the roll and firmly press the mat onto the roll, forming the mango slices to the top of the roll. Leave the plastic on the roll for cutting.
Cut the roll: Using a sharp knife, cut the roll into 8 pieces through the plastic wrap. I do this by first cutting the roll in half. Then I cut each half in half. I then cut each fourth in half. This should give you 8 pieces that are equal size. Once done cutting, remove the plastic from each of the pieces. Tip: Be sure to clean and wet the edge of your knife before cutting each roll. This will prevent the roll from sticking to your knife. Optional: Lightly drizzle with sweet mango sauce over the top of the mango slices.
Serve and enjoy: I usually serve with sweet mango sauce or unagi sauce.