Steamed veg with sautéed onion, garlic, lemon and tarragon dressing

Method

1. Put a large pan, half full of water, on to boil. Meanwhile, make the dressing. Put a medium frying pan over a medium heat and pour in a glug of olive oil. Add the chopped onion and fry for 10 minutes, then add the crushed garlic. Cook for 2-3 minutes more, then tip into a large serving bowl and mix lemon zest and juice, roughly chopped tarragon and extra-virgin olive oil. Season to taste.
2. When the water is just boiling, put a colander or steamer over it (not touching the water). Add the leeks, broccoli and frozen peas. Cover and steam for 3-4 minutes until just cooked but still crunchy (you may need to do this in batches). Tip the steamed veg into the bowl that contains the dressing, then toss well and serve.