// First item represent item in the top left slot
// Second is the list of items what player can place to middle slot
// Last one is the result of that recipe what appears in top right slot
AnvilRecipe r = new AnvilRecipe(new ItemStack(Material.DIAMOND_SWORD), Arrays.asList(new ItemStack(Material.NETHERITE_INGOT)), new ItemStack(Material.NETHERITE_SWORD));
// Always remember to register your recipe like that
RecipesManager.addAnvilRecipe(r);

ItemStack item = new ItemStack(Material.DIAMOND_SWORD);
List<ItemStack> ingredients = Arrays.asList(new ItemStack(Material.DIAMOND), new ItemStack(Material.EMERALD));
// First item represent item in the top left slot
// Second argument is boolean to set if recipe need exact item or only the same material type
// Third is the list of items what player can place to middle slot
// Fourth is the same as third but for ingredients
// Next one is the result of that recipe what appears in top right slot
// And last one represents level cost of that recipe
AnvilRecipe r = new AnvilRecipe(item,false, ingredients,false, item,10);
r.setFunction(event -> {
    // In here you can make all magic stuff with your recipe
    // For example I make a recipe to adding sharpness level for diamond sword, but only diamond can by apply more than once
    ItemStack item0 = event.getInventory().getItem(0);
    ItemStack item1 = event.getInventory().getItem(1);
    ItemStack result = item0.clone();
    if (!item0.getItemMeta().hasEnchant(Enchantment.SHARPNESS)) {
        result.addEnchantment(Enchantment.SHARPNESS,1);
    } else {
        if (item1.getType() == Material.DIAMOND)
            result.addEnchantment(Enchantment.SHARPNESS,result.getEnchantmentLevel(Enchantment.SHARPNESS) + 1);
        else
            result = new ItemStack(Material.AIR);
    }
    // For finish function you need to return item what you want as result
    return result;
});
// Always remember to register your recipe like that
RecipesManager.addAnvilRecipe(r);

// First item represents the first item of recipe can be placed in both slots
// Second is the list of items what player can place to another slot
// Last one is the result of that recipe what appears in top right slot
GrindstoneRecipe r = new GrindstoneRecipe(new ItemStack(Material.DIAMOND_SWORD), Arrays.asList(new ItemStack(Material.NETHERITE_INGOT)), new ItemStack(Material.NETHERITE_SWORD));
// Always remember to register your recipe like that
RecipesManager.addGrindstoneRecipe(r);

ItemStack item = new ItemStack(Material.DIAMOND_SWORD);
List<ItemStack> ingredients = Arrays.asList(new ItemStack(Material.DIAMOND), new ItemStack(Material.EMERALD));
// First item represents the first item of recipe can be placed in both slots
// Second argument is boolean to set if recipe need exact item or only the same material type
// Third is the list of items what player can place to another slot
// Fourth is the same as third but for ingredients
// Last one is the result of that recipe what appears in top right slot
GrindstoneRecipe r = new GrindstoneRecipe(item,false, ingredients,false, item);
r.setFunction(event -> {
    // In here you can make all magic stuff with your recipe
    // For example I make a recipe to adding sharpness level for diamond sword, but only diamond can by apply more than once
    ItemStack item0 = event.getInventory().getItem(0);
    ItemStack item1 = event.getInventory().getItem(1);
    ItemStack result = item0.clone();
    if (!item0.getItemMeta().hasEnchant(Enchantment.SHARPNESS)) {
        result.addEnchantment(Enchantment.SHARPNESS,1);
    } else {
        if (item1.getType() == Material.DIAMOND)
            result.addEnchantment(Enchantment.SHARPNESS,result.getEnchantmentLevel(Enchantment.SHARPNESS) + 1);
        else
            result = new ItemStack(Material.AIR);
    }
    // For finish function you need to return item what you want as result
    return result;
});
// Always remember to register your recipe like that
RecipesManager.addGrindstoneRecipe(r);

// First argument is ingredient item placed in top slot
// Second argument is list of items what can be placed in three bottom slots and in the end of brewing will be changed
List<ItemStack> items = Arrays.asList(new ItemStack(Material.LEATHER_HELMET),
        new ItemStack(Material.LEATHER_CHESTPLATE),
        new ItemStack(Material.LEATHER_LEGGINGS),
        new ItemStack(Material.LEATHER_BOOTS));
BrewingRecipe recipe = new BrewingRecipe(new ItemStack(Material.BLACK_DYE), items);
recipe.setFunction( pair -> {
    // In here you can make all magic stuff with your recipe
    // pair is the object what stores item what are changed with that recipe and brewery inventory if you want to check or change another stuff
    // For example I make a recipe to dye leather armor with black dye
    ItemStack item = pair.item();
    if (item.getItemMeta() instanceof LeatherArmorMeta meta) {
        meta.setColor(Color.BLACK);
        item.setItemMeta(meta);
    }
    return item;
});
RecipesManager.addBrewingRecipe(recipe);

ItemStack ingredient = new ItemStack(Material.BLACK_DYE);[/LEFT]
List<ItemStack> items = Arrays.asList(new ItemStack(Material.LEATHER_HELMET),
        new ItemStack(Material.LEATHER_CHESTPLATE),
        new ItemStack(Material.LEATHER_LEGGINGS),
        new ItemStack(Material.LEATHER_BOOTS));
// First argument is ingredient item placed in top slot
// Second argument is a boolean to set if recipe need exact ingredient or only the same material type
// Third argument is list of items what can be placed in three bottom slots and in the end of brewing will be changed
// Fourth is the same as third but for items
// Fifth one is fuel consumption, default value is 1
// And last is the brewing time, default value is 400
BrewingRecipe recipe = new BrewingRecipe(ingredient,false, items,false,1,400);
recipe.setFunction( pair -> {
    // In here you can make all magic stuff with your recipe
    // pair is the object what stores item what are changed with that recipe and brewery inventory if you want to check or change another stuff
    // For example I make a recipe to dye leather armor with black dye
    ItemStack item = pair.item();
    if (item.getItemMeta() instanceof LeatherArmorMeta meta) {
        meta.setColor(Color.BLACK);
        item.setItemMeta(meta);
    }
    return item;
});
RecipesManager.addBrewingRecipe(recipe);

ItemStack ingredient = new ItemStack(Material.BLACK_DYE);
List<ItemStack> items = Arrays.asList(new ItemStack(Material.LEATHER_HELMET),
        new ItemStack(Material.LEATHER_CHESTPLATE),
        new ItemStack(Material.LEATHER_LEGGINGS),
        new ItemStack(Material.LEATHER_BOOTS));
ItemStack fuel = new ItemStack(Material.COAL);
// First argument is ingredient item placed in top slot
// Second argument is a boolean to set if recipe need exact ingredient or only the same material type
// Third argument is list of items what can be placed in three bottom slots and in the end of brewing will be changed
// Fourth is the same as third but for items
// Fifth one represents custom fuel for that recipe
// Sixth argument is e boolean to set if fuel must be the same item or only the same material type
// And last is the brewing time, default value is 400
BrewingRecipe recipe = new BrewingRecipe(ingredient,false, items,false, fuel,false,400);
recipe.setFunction( pair -> {
    // In here you can make all magic stuff with your recipe
    // pair is the object what stores item what are changed with that recipe and brewery inventory if you want to check or change another stuff
    // For example I make a recipe to dye leather armor with black dye
    ItemStack item = pair.item();
    if (item.getItemMeta() instanceof LeatherArmorMeta meta) {
        meta.setColor(Color.BLACK);
        item.setItemMeta(meta);
    }
    return item;
});
RecipesManager.addBrewingRecipe(recipe);

// First is the fuel item
// Second is boolean to set if you want to use exact fuel item or only the same material type
// Last argument represents how many fuel loads when fuel are consumed, full loaded brewing stand is 20
RecipesManager.addBrewingFuel(new ItemStack(Material.COAL),false,10);

// To remove all recipes with some material as result use
RecipesManager.removeCraftingRecipe(Material.LEATHER_BOOTS);
// To remove all recipes with certain item stack with lore or enchantments use that
RecipesManager.removeCraftingRecipe(yourItemStack);