Thinly slice the red onion. Heat a tablespoon of olive oil in a skillet over a medium heat. Add the onion and sweat for a minute until just tender. Reduce the heat to low and continue to cook the onions until golden and starting to caramelize.
Step 2
Whilst the onions are cooking, add the green beans to a pan of boiling water and simmer for 4-5 minutes until just tender. Drain completely.
Step 3
Once the onion is golden, crush the garlic and add to the pan with the remaining oil. Sweat gently until tender and the onion starts to crisp.
Step 4
Add the beans to the skillet and toss in the garlic, onion and oil, cooking for a minute or two until heated through.