Bring a medium pan of water to a boil. Blanch the asparagus until crisp-tender, 1 to 3 minutes depending on the thickness of the asparagus. Plunge the asparagus into ice water to stop the cooking. Drain and pat dry. Cut each asparagus in half so that you have 2 pieces about 3 inches each.
For the stalk halves of the asparagus: Place a spring roll wrapper on a flat surface with the corner pointed toward you. Lightly brush the center of the wrapper with oyster sauce. Lay a piece of the stalk-half of asparagus across the wrapper from corner to corner. Fold in the side corners of the wrapper toward the middle, fold up the bottom corner and then roll up. Seal the top of the wrapper by brushing some of the cornstarch mixture along the edges of the wrapper to help seal. Put the rolls onto a plate seam-side down while making the remaining rolls.
For the spear end of the asparagus: Place a spring roll wrapper on a flat surface with square to you. Lightly brush the middle of the wrapper with oyster sauce. Lay a piece of asparagus with the tip overhanging the edge away from you. Fold up the bottom toward the center. Fold in one side of the wrapper toward the middle and then roll up. Use cornstarch mixture along the edge of the wrapper as a paste to help seal. Put onto a plate seam-side down while preparing the remaining rolls.
Heat a small skillet over medium-high heat and add some of the vegetable oil. Add the rolls a few at a time and shallow fry, turning as they become golden brown; do not fry too many at one time and overcrowd the skillet. Once golden, remove from the skillet and drain on paper towels.
On a small plate, mix together the black and white sesame seeds. Brush the cooked rolls with a little honey, and then roll them in the sesame seeds and serve.
Recipe courtesy of Ching-He Huang, 2011