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Bring 2½ cups of water to a rolling boil in a medium saucepan, then add the quinoa and stir once to separate the grains. Reduce the heat to a gentle simmer and cook uncovered for 15–18 minutes, until the water is fully absorbed and each grain reveals a tiny white spiral at its centre — that curling germ is your sign it's perfectly done. Fluff immediately with a fork and spread loosely to cool, resisting the urge to stir again so the grains stay light and distinct.
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While the quinoa cooks, preheat your oven to 200°C (400°F). Drain and rinse the chickpeas under cool running water until the water runs completely clear, then spread them on a clean tea towel and pat firmly until they are as dry as you can get them — this step is what stands between you and a truly crispy result. Toss with a tablespoon of olive oil, a generous pinch of salt, and several grinds of black pepper, then arrange in a single, uncrowded layer on a large baking tray.
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Slide the tray into the oven and roast for 20–25 minutes, shaking the tray once halfway through, until the chickpeas are deep golden-brown and sound faintly hollow when the tray is rattled — that dry, papery rattle tells you moisture has fully escaped. Remove from the oven and leave on the tray for 2 minutes; they will continue to crisp as they cool, so trust the process and resist snacking on too many.
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While the chickpeas roast, prepare the vegetables with care for uniformity — dice the red bell pepper and cucumber into neat 5 mm pieces, halve the cherry tomatoes, and slice the red onion as thinly as you can manage. Combine everything in a large mixing bowl, where the colours will already look like a painting. Keeping the cuts consistent means every mouthful delivers each element in the same breath.
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Make the tahini dressing by combining the tahini, olive oil, lemon juice, minced garlic, and chopped fresh parsley in a bowl or jar, then whisk or shake vigorously, adding water a tablespoon at a time — you're aiming for a pourable, satiny consistency that coats the back of a spoon like single cream, which usually takes about 60 ml of water in total. Taste and season with salt and black pepper, then taste again — a dressing this good deserves your full attention.
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To assemble, divide the cooled quinoa among four wide bowls as a generous base. Arrange the fresh vegetables, crispy chickpeas, and crumbled feta in distinct sections on top, letting the colours speak for themselves before you bring it all together. Drizzle the herb tahini dressing generously over each bowl, allowing it to pool and weave between the ingredients, then serve immediately at room temperature — or lightly chilled if assembling ahead — for the most vibrant contrast of textures.