public class CookingRecipeExample implements ModInitializer {
    [...]
    public static final RecipeType<TestRecipe> TEST_RECIPE_TYPE;
    
    static {
        [...]
        TEST_RECIPE_TYPE = Registry.register(Registry.RECIPE_TYPE, new Identifier(MOD_ID, "test_furnace"), new RecipeType<TestRecipe>() {
            @Override
            public String toString() {return "test_furnace";}
        });

    }
}