Drop in the zucchini strands, swirl around, and then immediately bring them back out and into an ice bath.
Transfer to paper towels to drain. (You want to blanch them to soften a bit but don’t want to cook them to mush.) Alternatively, you can place the zucchini strands in a bowl with plastic wrap and microwave for 2-3 minutes and repeat the ice bath step as directed.
To assemble the summer rolls, lay the lettuce leaves on a work surface as flat as possible.
Arrange the avocado slices on the lettuce leaves.
Stack the vegetables and mint on top lengthwise.
Pile on the veggies as little or as much as you want. Don’t overstuff or you won’t be able to roll them.
Fold in the sides of the leaves and roll up the wraps as you would burritos.