Methods to prepare:
- Heat the river stone for about 5-20 minutes. Use a gas stove to cook over low heat. Do not use a high heat because the stone will crack and split.
- Not too long if you don’t want the fabric to burn. Cover the cloth with betel leaves, noni or galangal leaves before placing the stone.
- Do it in each section for 5-10 minutes and repeat in the other section.
- Normally, the heat of the stone can last about 1 hour.