For those wanting an uncomplicated vegan savoury Huel, we’ve been having a good degree of success recently with 400ml tomato juice, 3 scoops of U/U, some smoked paprika (contrary to @BenTheBus’s experience), tabasco or other chilli, and topped up with water. 400ml tomato juice adds 80kcal to the meal, i.e. 16% more calories. If counting calories, an easy compensation would be to simply use 2½ scoops of Huel instead of three, giving 497 calories.
This can be made successfully by hand in the shaker.