Put water to a boil. Once bubbling, turn the heat off and add in your vermicelli with some salt. Cover the pot with a lid and let the noodles cook. Remember, turn heat OFF. Noodles should take about 10 minutes, or until al-dente.
While noodles are cooking, start cooking your veggies. Add oil to a pan on medium heat. Once it's hot, add in the sliced onion, radish, and serrano peppers. Let them cook down for 2-3 minutes.
Then add in your garlic, serrano peppers, and spinach. Add some salt to taste. Mix everything up and cook until the spinach has wilted completely.
Mix together all sauce ingredients and adjust for seasoning if you want more or less of anything.
The noodles should be done within 10 minutes, so now strain the water out. Vermicelli is very long, so I like to take scissors and cut it to smaller strands. That step is optional.
Add the noodles directly into your pan of veggies, followed by the sauce. Mix well and taste for seasoning.
Serve hot & by itself, or you can put them on lettuce and eat them like a wrap!