To prepare the cucumbers, wash the cucumbers thoroughly and trim off the ends. Using the flat side of a knife or a rolling pin, gently smash each cucumber until it cracks. Cut into bite-sized pieces.
Transfer the cucumbers to a plate. Sprinkle with the salt and sugar, then let them rest for 10 minutes. Discard any liquid released from the cucumbers.
To prepare the aromatics, in a heatproof bowl, combine the sesame seeds, garlic, and red chili pepper.
To make the aromatic oil, in a small saucepan over low heat, combine the avocado oil and shallot. Cook for about 5 minutes, or until the shallot is lightly golden and fragrant.
Remove the shallot and increase the heat until the oil is smoking hot. Carefully pour the hot oil over the garlic, sesame seeds, and chili.
To make the dressing, add the soy sauce, sugar, and Chinkiang vinegar to the bowl. Stir until well combined.
To assemble the salad, pour the dressing over the drained cucumbers. Add the cilantro and toss until evenly coated.
Serve immediately.