Place 1 rice paper round in the water until softened, about 30 seconds. Remove rice paper from the water and place on a towel. Pat dry. Repeat with the rest of the rice paper. Divide the strawberry filling among the rice paper rounds, placing it in the center of each round. Fold in the sides and roll up each round tightly.

Combine the cabbages and watercress and place on a platter. Cut each strawberry roll in half (cut on an diagonal looks prettier). Whisk together dressing ingredients until well blended. Toss the greens with 1/2 the dressing. Arrange the cut strawberry rolls on the greens and drizzle with the rest of the dressing. Garnish with black sesame seeds and fresh strawberries.