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Cook the beans in a pan of boiling water for 3 mins until just tender, adding the chickpeas for the final min of cooking. Meanwhile, make the dressing: in a large bowl, whisk the lime juice and zest with 3 tbsp of the oil and the chilli. Season. Drain the chickpeas and beans and, while warm, toss with the dressing.
Pour boiling water over the red onion, leave for 5 mins to soften, then drain and rinse. Add the peppers, tomatoes, rocket, parsley and softened onion to the bean bowl. Toss to coat everything in the dressing, then divide between 2 plates.
Heat the remaining oil in a frying pan, add the halloumi slices and fry for about 1 min on each side until golden. Place a few warm halloumi slices on top of each salad and serve.