He recently set up an organic and sustainable vegetable farm, growing most of his own crops in the nearby Stellenbosch region, and has a herb garden on the hotel's roof.
In winter, he grows beetroot, carrots, Chinese cabbage, cauliflower, beans, peas, chard, leeks, spring onions, broccoli and cabbage. For summer he will grow pumpkins, tomatoes, peppers, brinjal, baby marrow, gem squash, butternut, onions and strawberries.
The vegan dishes mostly use raw vegetables, served as fresh as possible.
Excited by the vegan menu, an order is put in for a starter of beetroot raviolli, followed by a salad of brinjal parcel, nut and seed couscous, quinoa, courgette and peas. A vegan cheesecake is ordered for dessert.
Each of the dishes is immaculately prepared and delicious.
Local feedback has been slow, but "this is a slow journey", Liebenberg says. "For me and my staff it was the only direction to take. The raw food was clean and brought a different perspective to the dining experience.
"Understanding what a carrot can be when raw, cooked, roasted, pureed, whatever, it gives us more to work with. I do not want to add cream to a dish if it is not going to add purpose and most of the time it disguises the true flavour of food. We might like the taste, but it is not pure and it is not clean," he says.
CHECKLIST
CAPE TOWN
GETTING THERE
Qantas Airways flies from Sydney to Johannesburg, from where Cape Town is a two-hour flight.
WHERE TO STAY
The five-star Mount Nelson Hotel has options starting at $460 a night. See mountnelson.co.za.
FOR MORE INFORMATION
Visit southafrica.co.za and planetbarandrestaurant.co.za.
* P.K. Stowers travelled to South Africa with assistance from South African Tourism.