Remove the base of the lemongrass. After peeling off the tough outer layers, thinly slice the first third of the stalk.
Slice the beef into strips.
Wash the chili, cut it in half lengthwise, remove the seeds, and chop the flesh.
Press the garlic cloves to extract the pulp.
In a bowl, mix the beef strips with garlic, lemongrass, 1 tbsp nuoc mam sauce, 1 tbsp lime juice, 1 tbsp honey, 1 tbsp soy sauce, and pepper. Cover with plastic wrap and refrigerate for 30 minutes.
Cook the Asian noodles according to the package instructions. Drain them.
Peel the carrots, remove the ends, and grate them.
Wash the cucumber section, cut it in half, then slice into sticks.
In a bowl, mix 4 tbsp nuoc mam sauce with 4 tbsp honey, 3 tbsp rice vinegar, 2 tbsp lime juice, 1 tbsp soy sauce, 2 tbsp sesame oil, and a bit of water.
Peel the white onion and slice it thinly.
In a large skillet, sauté the onion in the neutral oil with a pinch of salt over medium-high heat for 5 minutes, stirring regularly.
Add the marinated beef and continue cooking for 3 to 4 minutes, stirring.
Cut the spring rolls into regular pieces.
Arrange the ingredients harmoniously in 3 bowls.
Drizzle everything with the vinaigrette. Garnish with fried onions.
Decorate with chopped mint leaves.