To move with the times, he recently introduced dishes such as rojak chicken katsu topped with fruit salad; "Kra Pao" Thai basil minced chicken bee tai mak; and Muar otah mantou sliders, served with achar relish and a dash of sambal mayonnaise - a refreshed version of the company's signature Muar otah.
Other subsidiaries under the parent company include Continental Delight, which focuses on international fusion cuisine; the soon-tolaunch Muse, which offers high- end menus for private dining; and social arm The Hesed Table, which provides food for migrant workers.
Wanting to be a "one-stop solution" for events - especially weddings - the company also provides event styling, from floral decoration to customising invites.
Mr Ang is also committed to preserving the heritage flavours that Elsie's Kitchen is known for. He dedicates a few months each year to taking courses at the Asian Culinary Institute in Eunos, which focuses on Asian cooking.
He says: "Growing up, I used to cook more Western dishes such as pasta, steak and pizza. But in recent years, I've learnt to appreciate Asian cooking a lot more, especially through my work. It was the uncool thing that your parents are good at that you don't want to do.
"But now, learning to make a good sweet and sour sauce or how to toss the wok for maximum wok hei is very interesting."
Tell us some tricks of the trade in the catering business.
You can't have too many deep-fried items on the menu as the texture changes over time.
Recipes have to be modified too. For example, we wanted to do a cuttlefish and kangkong dish, but kangkong discolours very easily, so we did a kang kong tempura, which keeps the vegetable's shape and colour.
Food has to be easy to eat if we are catering canapes. Everything has to be bite-sized.
We have to be careful with barbecued items as the meat dries out very easily, so we offer them only for live station cooking. We have to be careful with the venue as well. Once, we did a wedding with a barbecue live station and, although it was outdoors, all the smoke blew into the hall - the air quality looked like it was PSI 400 and everyone smelt of smoke.
What is the first dish you cooked?
I learnt to make mashed potatoes at the age of three.
Have you had any kitchen disasters?
I was cooking Japanese curry and chicken katsu for more than 100 friends. However, the rice was not steaming and the chicken was not cooked properly. In the end, I called the Elsie's Kitchen factory for support, and everything was ready in 20 minutes. This incident taught me to have proper planning.
What are your favourite restaurants?
Middle Eastern restaurant Artichoke in Middle Road, which is good for dining in big groups and ordering sharing platters. After work, we like to go to The Refinery in King George's Avenue and GastroSmiths at Katong I12. For family gatherings, we go to Violet Oon Singapore in Bukit Timah.
Are you an adventurous diner?
My father always encourages us to try something at least once, to know whether we like it or not. I've eaten deep-fried sparrow in Shanghai, which was too bony and troublesome to eat. I also recall dining at an African-themed restaurant here, which served plenty of game meat, when I was in primary school. I remember eating zebra steak.
What is the next stop on your dining list?
The popular Song Kee Fishball Noodle, which used to be in Upper Serangoon Road and has re-opened in Joo Chiat. I went once to eat it, but was told to wait for 45 minutes. I left, planning to go at a better time.
What would you be doing if you were not in the family business?
When I graduated, I wanted to run a cafe as it was the "in" thing then. My father discouraged me as I did not understand the scene well enough. Now I see how hard it is to hire enough manpower and there are too many options for diners.
I have a wild plan to have my own food truck one day. I also wouldn't mind doing ready-to-eat meals. After all, its image is changing. People are less likely to associate it with combat rations.
If you could invite someone dead or alive for a meal, who would you pick?
My late grandmother. I don't remember much of her, but I always hear stories of her food such as economy beehoon and vinegar pig trotters. I would love to share with her what we do now.