Wash cucumbers and trim the ends. Smash them lightly with a rolling pin or knife handle until slightly split. Cut into rough 1-inch chunks.
Step 2: Salt the cucumbers
Toss cucumber chunks with salt in a bowl. Let sit for 10 minutes to draw out excess water. Drain and pat dry with paper towels.
Step 3: Make the dressing
Mix garlic, chili oil, sesame oil, sugar, and rice vinegar in a small bowl. Stir until the sugar dissolves completely.
Step 4: Combine and chill
Pour the dressing over the cucumbers. Toss gently to coat. Refrigerate for 5 minutes before serving for maximum crispness.
Notes
Swap chili oil with 1/2 tsp chili flakes + 1 tbsp neutral oil for less heat. Add toasted sesame seeds for crunch. Fresh cilantro works for extra brightness.