no demo:

    public static void listIngredients(Pizza pizza) {

        String name;
        Scanner scanIn = new Scanner(System.in);
        System.out.println("Digite o nome da pizza");
        name = scanIn.nextLine();

        String[] ingList = pizza.getIngredients(name);
        for (String ingName : ingList) {
            if (ingName != null) {
                System.out.println(ingName);
            }
        }

//        Ingredients[] ing = null;
    }


na classe Pizza

    public String[] getIngredients(String name) {
        int j = this.numberOfIngredients;
        String[] ingredientsName = new String[j];

        //Estava aqui
        for (int i = 0; i < j; i++) {
            if (ingredients[i] != null) {
                if (name.equals(this.name)) {
                    ingredientsName[i] = ingredients[i].getName();
                }
            }
        }
        return ingredientsName;

    }