Place the dried chickpeas in a large bowl and cover generously with cold water — by at least 5–6cm, as they will roughly double in size during the soak. Add ½ tsp of baking soda and stir briefly to dissolve. The alkaline environment created by the baking soda progressively weakens the pectin in the chickpea skins and cell walls throughout the soaking period, beginning the softening process before any heat is applied and ensuring the chickpeas will cook completely through to a uniformly soft, blendable consistency. Soak for 8 hours at room temperature or overnight. Drain and discard the soaking water — it contains released starches and the spent baking soda solution.

Transfer the soaked, drained chickpeas to a large pot. Cover with fresh cold water by approximately 5cm and add the remaining ½ tsp of baking soda. Bring to a boil over medium-high heat, skimming any grey foam that accumulates at the surface as the water heats — this is coagulated protein and starch that should be removed for a cleaner-tasting result. Once boiling, reduce to medium-low heat, cover with a lid, and cook for approximately 30 minutes. Check at the 25-minute mark by removing a single chickpea and pressing it between your fingers or with a fork. It must crush completely and immediately with no resistance — any firmness means more cooking time is required. The double baking soda method, applied in both the soak and the cook, produces chickpeas soft enough that their skins blend invisibly into the finished hummus rather than producing graininess or texture. Drain when fully tender and proceed to processing immediately while still warm.

While the chickpeas cook, prepare the sun-dried tomatoes. Drain them thoroughly from their oil through a small strainer or by pressing between paper towels — excess oil carried into the food processor changes the hummus's fat content and can produce a slightly greasy consistency that the recipe is not calibrated for. Do not rinse — rinsing removes the tomato aromatic compounds that cling to the surface. After draining, roughly chop the tomatoes into smaller pieces if they are large — this helps them incorporate more evenly during processing rather than remaining as larger chunks that take longer to break down. Reserve a small amount of the drained oil if desired — a few drops can be used in the final serving drizzle for a flavour-specific garnish.

Transfer the drained warm chickpeas to a food processor immediately. Process for 2–3 minutes, stopping every 30–45 seconds to scrape down the sides and bottom of the bowl — any mass stuck to the walls is not being processed and will remain as coarser fragments in the final hummus. The warm chickpeas process significantly more smoothly than cold ones because the heat keeps the starch in a gelatinised, fluid state that blends easily. Process until the chickpeas have formed a thick, fairly smooth dry-looking paste — stiff and compact before the liquid ingredients are added, which is correct at this stage.

With the food processor running, add the tahini paste in a steady stream. Add the drained and roughly chopped sun-dried tomatoes, the fresh basil leaves, the lemon juice, lemon zest, smashed garlic cloves, ground cumin, a conservative starting amount of fine sea salt, and freshly ground black pepper. The sun-dried tomatoes are the flavour foundation of this variation — their concentrated, intensely sweet-acidic tomato character comes from the water having been removed during the drying process, which concentrates the natural sugars, acids, and umami compounds present in fresh tomatoes into a much smaller volume of fruit. The flavour intensity per gram is dramatically higher than fresh tomato — which is why a relatively small quantity of 70g produces a prominently tomato-forward hummus. The oil-packing further contributes: the olive oil in which sun-dried tomatoes are packed absorbs the fat-soluble aromatic compounds from the tomato over time, and these compounds transfer from the tomato surface into the hummus during blending. The fresh basil adds the clean, slightly peppery, sweet aromatic top note that Italian cooking specifically pairs with tomato — the basil and tomato combination is one of the most complementary flavour pairings in the Mediterranean tradition, and it works equally well in a hummus context as it does in a bruschetta or pasta sauce. Process for 2–3 minutes, scraping down frequently, until the mixture is as smooth as it will become before water is added. The hummus will already show its characteristic deep red-orange colour at this stage from the tomato pigments distributing through the chickpea base.

With the food processor running, begin adding the ice-cold water one tablespoon at a time, allowing each addition to fully incorporate before adding the next. The cold water emulsifies with the tahini's fat during mechanical processing, dispersing the fat molecules and producing the light, creamy, aerated texture that distinguishes well-made hummus from a dense paste. The sun-dried tomatoes contribute some of their own moisture to the mixture during processing, which means the total water requirement may be slightly less than for the classic version — assess by tablespoon and stop when the consistency is right rather than at a predetermined volume. For a dense, spreadable hummus use less water; for a looser, drizzleable consistency use more.

Stop the processor and taste carefully. The sun-dried tomato and basil hummus has a specific calibration challenge: the tomato's concentrated sweetness and acidity are both strong and can mask the need for salt and the basil's freshness simultaneously. If the hummus tastes sweet and one-dimensional, it needs more salt — add incrementally until the tomato's own character sharpens and the basil's freshness becomes more noticeable. If it tastes heavy and lacks brightness, add additional lemon juice — the lemon's acidity cuts through the tomato's richness and lifts the basil's aromatic compounds. If the cumin's earthiness is not present in the background, add a small additional pinch. If the basil character is too faint, add 3–4 additional fresh leaves and process briefly — fresh basil's volatile aromatic compounds are partially lost during the extended processing, and a small addition at the end of processing adds them back at full freshness.

Transfer to a wide, shallow serving bowl and create the characteristic hummus well by sweeping the back of a spoon from the centre outward in a circular motion. Drizzle generously with extra-virgin olive oil — or a small amount of the reserved sun-dried tomato oil for a specific, more intensely tomato-flavoured garnish. Scatter za'atar or sumac across the surface — sumac's fruity tartness provides excellent contrast to the tomato's concentrated sweetness. Scatter the fresh basil chiffonade — thin ribbons cut from a stacked pile of leaves — across the surface immediately before serving. Basil darkens quickly once cut and exposed to air, so chiffonade preparation should happen at the very last moment before the bowl goes to the table.