pocketmine\inventory\CraftingManager::registerBrewingRecipe PHP Method

    public function registerBrewingRecipe(BrewingRecipe $recipe)
    {
        $input = $recipe->getInput();
        $potion = $recipe->getPotion();
        $this->brewingRecipes[$input->getId() . ":" . ($input->getDamage() === null ? "0" : $input->getDamage()) . ":" . $potion->getId() . ":" . ($potion->getDamage() === null ? "0" : $potion->getDamage())] = $recipe;
    }