Cap the onions and the cloves of garlic at both ends, peel and halve lengthways. Wash the small, green chillies, cut into thirds crosswise, leave the grains in place and discard the stem. Wash the tomatoes, remove the stems, cut in half lengthways and remove the green stem. Halve the halves lengthways and crossways. Cut the fresh, washed and peeled ginger crosswise into thin slices. Weigh frozen goods.