Melt isomalt crystals in a small saucepan over medium-high heat. If needed, shake pan to facilitate melting. DO NOT STIR.
When all crystals have melted, work quickly to spoon the mixture into semi-sphere molds. The melted isomalt is very hot and can cause severe burns. Be very careful to avoid contact with skin.
Add a few drops of gel food coloring into each mold. This will bubble up and sizzle. It's ok.
Mix food color with melted isomalt using a small spoon.
Working quickly, use the back of the spoon to spread the colored isomalt mixture over the entire surface of the mold. Do this step as fast as you can, it won’t take long for the mixture to begin to set up.
Allow the halves to set completely before continuing, approximately 30 minutes.
Remove the top half of one sphere from the mold by carefully pushing up from bottom. Leave the bottom half in the mold; this will make it easier to assemble the globe.
Place 1 teabag (or one teaspoon of loose tea) in the bottom half of the globe in the mold along with any edible flowers, sugar cubes, or herbs you want to use. If you're using a teabag, you can either leave the tea bag string outside the mold or tuck it inside.
Reheat the small saucepan over low heat. This will be used to smooth the globe edges and ease joining the two globes together.
Place the globe top onto the bottom of the hot pan for just a few seconds to smooth and melt the edge. Quickly join the top to the bottom globe that is still in the mold.
Allow the tea bomb to cool 5-10 minutes. After 5 minutes, you should be able to remove the entire sphere from the mold by carefully pressing up on the mold to release the bottom half of the globe.