I don't use this sauce with rice, just dipping chicken into it though I assume poured over your dish would work also.
my favorite Asian dipping sauce I make is very simple to make ! measurements all depends on the amount you make & your taste, plus I just cook on the fly without care to measurements
this I've used for 5lbs chicken plain grilled or CI fried (EVOO or grape seed oil) (seems this sauce tastes best with chicken, though all other will be good too)
onion - 2 large (min)
garlic - ? 4-5 heaping teaspoons ? (prechopped in jar works great too)
CHILES!!!!! - bring it all you can handle, mix and match if you want for heat....serranos, jalapenos, hab's, ghost....what you have and want for heat. I use orange hab's cuz I can get fresh easily and with heat ( I Don't remember the number but I'd have to say over 12 big habs I normally use) & some dashes of bhut or scorpion powder into the sauce
those 3 ingredients cut it all up & split each item in half......half of it stays fresh...the other half gets sautéed (I use grape seed oil, though EVOO or butter works too)
I use those gourmet garden squeeze tubes (in pic above) for
lemongrass - at least 1/4 of tube maybe 1/3
ginger - at least 1/4 of tube maybe 1/3
or more to your taste.
some powder cinnamon
lime juice - about 1/4 cup (roughly to your taste & amount you make)
soy sauce - about half the bottle
those 2 liquid ammounts depend on the amount that you make, add enough where its not like a soup.....more veggies but you'll still have enough liquid for soaking ingredients & food for dipping.
the half of fresh veggies & other ingredients go in a glass bowl (add only small amount of liquids so you can adjust liquid amount when everything is in the bowl)...sautee the other half of veggies ...then throw into the bowl.....adjust liquid amount (lime & soy)....leave sit for about 1 hour (min 30min) in fridge to allow flavors to blend.
take what you plan to use for that meal right then & microwave that amount.
its a very simple dipping sauce to make & you can tweek it however you like for your taste & how hot you want it. more fresh chiles won't hinder this sauce.