Line a bamboo steamer with some lettuce leaves.
Take 1 cup flour in a bowl. Add ⅔ cup of warm water and salt and mix well. Set aside for 10-15 minutes.
To prepare vegetable mixture, put cabbage, spring onions, broccoli, carrot, French beans, salt and crushed peppercorns in a bowl and mix well.
Take remaining flour in another bowl. Add salt and 2 tablespoons water and mix well. Add to prepared flour and knead well. Transfer onto a worktop and knead again. Transfer into a bowl, cover with damp muslin cloth and set aside for 30 minutes.
Divide the dough into small equal portions.
To prepare harga dimsums, take a dough portion, dust with flour and roll from the edges to make a thin disc. Put in some vegetable mixture, fold, twist the edges to seal and fold the ends.
To prepare mouse dimsums, take a dough portion, roll out to make a thin disc, fill in some vegetable mixture, pinch one end, press it in and repeat till end.
Heat some water in a non-stick pan and bring water to boil. Place prepared dimsums in lined bamboo steamer, place the steamer in hot water and steam on high heat for 8-10 minutes.
To prepare ginger soy dip, heat soy sauce in a non-stick pan. Add some water and ginger, mix well and cook for 3-4 minutes. Add sesame seeds and sesame oil, swirl and cook 2 minutes.
Serve the dimsums hot with ginger soy dip.