@ Food Republic food court - Vivocity (Harbourfront MRT)
Kueh Tutu (aka Putu Piring) is a traditional Indian snack made of steamed rice flour. The most common fillings are coconut and peanut. It's almost a dying trade so you might need to go to specific places in order to find it. It's soft and slightly chewy, and pairs perfectly with coffee or tea.
About $2-$3 for 5 pieces
Where else to find:
Stall in Mr. Teh Tarik Coffee Stall (stall in a coffeeshop)
970 Geylang Road, #01-02
Contact: 94229017 (Call to check opening hours first)
Tan's Tu Tu Coconut Cakes (stall in a coffeeshop)
49 Clementi Ave 3, #01-211 (3pm to 9.30pm), Block 22B Havelock Road, #01-25 (9am to 3pm) 
Some food areas in the basement of shopping malls have a stall selling kueh tutu.
Pasar malams (if you come across a night market, there's a high chance of finding kueh tutus there)
Other reads:

• We love $1 street ice-cream
• Liang Seah Street and Eating Duck Tongue
• Traditional Kaya Butter Toast abd Half-Boiled Eggs

Yong tau foo is a common food stall in hawker centres and food courts in Singapore. It basically comprises a range of food items, mostly variations of beancurd or tofu, stuffed with fish paste. Other items in the Yong tau foo selection include fish balls, cuttlefish, cabbage and other vegetable choices, eggplant, hotdog, quail eggs and mushroom.
Yong tau fu, or stuffed beancurd ( 'Yong' means 'stuffed' in Hakka and 'tau fu' means tofu or beancurd), originated from the Hakkas (a Chinese dialect group).
How to order:
1. Pick up a bowl and pair of thongs.
2. Select the items you want (normally a fixed price for 6 or 7 pieces with rice or noodles)
3. Hand your bowl over to the stall holder and let them know if you want it ‘dry’ or in a soup. For the dry version, a sweet sauce is drizzled over your food.
4. Also tell the stall holder your choice of staple – rice or noodles. Normally the range of noodles available includes bee hoon (vermicelli) thick bee hoon, yellow noodles, kway tiao (flat white noodles)
5. Help yourself to the sauces available at the counter while you wait for your food.
You can get 6-7 pieces of yong tau foo with noodles or rice for about $3.50 to $5 on average.
Other local foods to check out:

• Soakers Love Eating Durian
• Enjoying Indian food... and Fish Eyes (Banana Leaf Apolo)
• Dim sum on Trolleys in Singapore (Red Star Restaurant)
• Roti prata
• Carrot cake Singapore Style