To make this decor you will need:

1. Cake with a dense stable coating. These include: fondant, ganaches with butter, butter cream, cheese cream.
2. Mesh stencil. Very interesting, but very simple tool. Keep Form is the only manufacturer of such instruments in Ukraine. You can see the entire range here
3. Decor gel (sold in any store for confectioners).
4. Gel-based colour.
5. Plastic spatula.

And now everything is detailed and in order:

1. Mix decor gel(pipping gel, royal icing) and colour. For decor, you will need no more than a tablespoon of decor gel. Color saturation directly depends on the amount of colour. For density of color, a little starch (1/4 teaspoon) can be added to the mixture.
2. If the cake is in fondant, then no preliminary actions are needed with it. If the cake is in any of the creams listed above, then it is better to cool it to eliminate the risk of injury to the coating. No need to freeze. Half an hour in the refrigerator and the cake is ready.
3. Make sure the mesh stencil is clean and dry.
4. Fix the mesh stencil on the cake using the same decor gel. Apply a few drops of gel to the surface of the cake and attach your tool to them. A few drops won't damage the finish. Decor gel is initially transparent, and the stencil will be securely fixed.
5. Apply colored decor gel to the edge of a plastic spatula
6. Spread the colored decor gel over the surface of the stencil with a spatula. Hold the spatula at an angle of 30-45 degrees to the cake. Decor-gel must be "smeared" into the surface of the stencil. No force is required on the spatula.
7. Once the decor gel is spread all over the stencil, remove the stencil from the cake.
8. After 5-7 minutes, the decor gel on the cake will dry to such an extent that you can touch it with your hands. In the meantime, prepare the stencil for reuse. Rinse in warm water, you can use detergents for washing dishes. The stencil is reusable and the surface of the stencil can only be damaged by mechanical action (for example, washing it with a metallized sponge)
9. We join the stencil and repeat the procedure. If you need to use only a fragment of the pattern to complete the decor, then the stencil can be pasted over with simple adhesive tape. That. you will 100% exclude the possibility of spoiling the already made drawing on the cake.