Slippery liang fen jelly noodles in a spicy, garlicky sauce are a refreshing Sichuan snack. A vegetarian, healthy dish perfect for fresh summer family meals.
In a medium saucepan, whisk together mung bean starch and 1 cup of water until fully dissolved and smooth. Set the remaining 2 cups of water aside.
Bring the 2 cups of water to a boil over medium-high heat. Reduce heat to low and gradually pour in the mung bean mixture, stirring constantly.
Continue stirring on low heat until the mixture thickens and turns translucent, about 3–4 minutes. Immediately pour into a lightly oiled 8x8-inch dish to set.
Let the jelly cool at room temperature for 1 hour, then refrigerate for at least another hour until fully firm.
Run a thin knife around the set jelly and invert onto a cutting board. Slice into thin, noodle-like strips.
In a bowl, combine minced garlic, soy sauce, black vinegar, chili oil, sesame oil, sugar, and salt to prepare the sauce.
Arrange liang fen noodles in serving bowls, top with julienned cucumber, and pour the sauce evenly over each portion. Serve chilled.