To blanch the green beans, bring a pot of water to boil. Add the beans and bring it to a boil again. While the water is boiling, keep some ice water ready. As soon as the water starts boiling, remove the beans, drain and rinse them with cold water. Set aside.
In a skillet, cook bacon till its golden brown. Add garlic to the pan and saute for a minute. Add the brown sugar and chilli flakes and mix well. The brown sugar will start melting and the sauce will start bubbling.
Add the beans and toss to coat well. Cook for another minute or so, season with salt and pepper and switch off the flame. Serve immediately.
You can easily substitute frozen beans for fresh beans. In that case you can skip step 1 and start directly from step 2. Once you add the beans, you'll need to let them cook for an extra 2-3 minutes to let them defrost in the pan.