Do I really need glutinous rice?
For this dish, yes. Regular jasmine or basmati can still be delicious, but it will not turn into mango sticky rice. It will be more like a mango-and-coconut rice dessert, since you will not get that stretchy, cohesive texture. Look for bags labeled glutinous rice, sweet rice, or sticky rice in the Asian aisle or at an Asian market.
Quick note: glutinous rice does not contain gluten. The name refers to the sticky, gluey texture.
Can I make it without a bamboo steamer?
Absolutely. A metal steaming basket, a collapsible steamer insert, or even a fine mesh sieve set over simmering water works. The goal is steam, not boil. Keep the rice in cheesecloth or a thin kitchen towel so the grains do not fall through.
Why is my sticky rice hard in the middle?
Two usual suspects: it was not soaked long enough, or it did not steam long enough. Soak at least 4 hours, then steam until the grains look more translucent and feel tender when you pinch one between your fingers. When in doubt, taste a few grains. They should be tender all the way through.
Why did my rice turn mushy?
That happens when the rice absorbs too much water directly. Make sure you are steaming the rice above the water level, not simmering it in water like pasta. Also drain it very well after soaking.
What mango is best?
In the US, Ataulfo (Honey) mangoes are my favorite here because they are silky, sweet, and not too fibrous. Any ripe mango works. Just avoid under-ripe mango unless you want more tang than dessert.
Can I use light coconut milk?
You can, but full-fat coconut milk gives the sauce that rich, spoon-coating texture. If you use light, the sauce will be thinner and less luxurious.
Is there a substitute for mung beans on top?
Traditional versions sometimes use crispy split mung beans. They are great but not mandatory. Toasted sesame seeds or even toasted coconut flakes give you that little crunch moment.