Roll out a piece of Fimo clay to about 3 mm thick. Cut out long strips of clay that can reach all the way around the vegetable. Then pin the strips of clay in place around the middle of the vegetable.
Combine plaster powder with water to a relatively thick consistency. Apply the plaster to half of the vegetable, up to the clay strip, using a spatula or something similar.
Remove the strip of clay when the plaster has set and turn the vegetable over. Brush the edge of the plaster, where the clay was, with liquid latex and then with cooking oil to make it easier to split the mould later.
Mix a new batch of plaster and apply it to the other half of the vegetable, but leave an approximately 5-cm-wide hole plaster-free.
Remove the plaster pieces from the vegetable once they have set and let them dry. Brush the inside of the plaster pieces with cooking oil.
Use masking tape to tape the plaster pieces together.
Mix concrete and fill the mould through the hole. Shake the mould carefully to evenly distribute the concrete and to get rid of any air bubbles.
Let the concrete harden for 1 to 2 days and then remove the plaster mould.
Decorate indoors and out with concrete! The raw finish of concrete is beautiful in its simplicity, and casting is not that difficult. Here, we show you how to cast an aubergine, but the technique can be used for all fruits and vegetables. For example, winter squash are quite forgiving to cast and come in tons of fun shapes and sizes. When making the mould, remember to put the hole on the bottom, so that it is as concealed as possible on the finished concrete object.
NOTE: Make sure that your clothes, skin and work surface are protected. Wear protective gloves and a protective respiratory mask when working with concrete. It is best to mix concrete outdoors because of the dust it gives off. Find a shady spot out of direct sunlight so the concrete does not dry too fast and crack.