Kazun Ywek Thoke (Watercress Salad)

Ingredients

• Tbs. vegetable oil
  3 unit
• Onion

  sliced
  1 unit
• garlic

  sliced
  2 cloves
• Tbs. sesame seeds
  1 1/2 unit
• scallions

  thinly sliced
  2 unit
• crushed red pepper

  or to taste
  1 tsp
• Tbs. soy sauce
  2 unit
• Tbs. granulated sugar
  1 1/2 unit
• salt to taste
  1 unit
• Tbs. white vinegar
  2 unit
• freshly ground black pepper
  1/2 tsp
• watercress

  rinsed and trimmed into 1-inch lengths
  2 bunches