What's the best way to teach kids to eat veggies?

I used to sneak veggies in different meals when I was feeding my little cousin. My Tita used to finely chop veggies like sayote or upo which she used to mix with rice. Kids, especially toddlers, oftentimes have to get used to eating different veggies before they like the taste so what we did was to introduce one veggie at a time.