Peel the garlic cloves and inspect each one for a green inner sprout — the small green shoot found in the centre of slightly older cloves. These sprouts contain higher concentrations of allyl compounds that produce a notably more bitter, more aggressively pungent flavour than the surrounding clove. Halve each clove and remove the sprout with the tip of a knife before processing. This step requires only 2–3 additional minutes and produces a noticeably less bitter, more pleasant finished toum. Garlic sourced very fresh — tight, firm, dry heads with no visible sprouting — will have minimal or absent sprouts.

Add the 40g of peeled, sprout-free garlic cloves and 5g of fine sea salt to a small food processor, mini chopper, or the tall, narrow container of an immersion blender. The container size matters: a large standard food processor bowl processes such a small quantity of garlic inefficiently — the blades cannot make consistent contact with only 40g of material. A mini chopper or the narrow container of an immersion blender maintains close contact between the blades and the small garlic quantity throughout processing. Process until the garlic is very finely minced and beginning to form a smooth, slightly wet paste — scraping down the sides of the container frequently to ensure every piece of garlic is processed equally. The goal at this stage is the smoothest possible garlic paste before any oil enters: visible garlic pieces in the finished toum produce uneven texture and inconsistent garlic-to-oil ratios in each spoonful. The salt draws moisture from the garlic cells during processing and assists in producing a finer, more uniform paste.

This is the most critical and most time-sensitive stage of the recipe. With the food processor or immersion blender running continuously without interruption, begin adding the neutral oil in the smallest possible stream — almost individual drops at first. Toum is an emulsion — a stable suspension of oil droplets within a water-based continuous phase (the lemon juice and garlic's moisture). Unlike mayonnaise, toum contains no egg yolk and therefore no lecithin — the phospholipid emulsifier that makes mayonnaise relatively forgiving of irregular oil addition. Without lecithin, toum's emulsion is maintained entirely by the mechanical action of the blades continuously breaking oil into smaller and smaller droplets and by the gradual build of an emulsification film from the garlic's own proteins and saponins. This physical emulsification is dramatically less tolerant of rapid oil addition than lecithin-anchored mayonnaise — a sudden large pour of oil overwhelms the film's ability to encapsulate incoming droplets, and the emulsion breaks into a separated pool of oily liquid. The drop-by-drop addition allows each small quantity of oil to be fully dispersed into the existing emulsion before the next quantity arrives — building the emulsion progressively rather than overwhelming it.

After 3–4 tablespoons of oil have been incorporated and the mixture appears creamy and stable — slightly thickened and paler than the initial garlic paste — begin the alternating oil-and-lemon-juice addition sequence. With the blender running, add a small amount of lemon juice — approximately 1 teaspoon — and allow it to fully incorporate. Then resume the slow oil drizzle for another 3–4 tablespoons. Then add another small amount of lemon juice. Continue alternating throughout the entire build. The alternating addition serves a specific structural function: lemon juice's water content provides the aqueous phase that the oil droplets must be suspended within — it maintains the emulsion's water-to-oil balance and prevents the oil phase from becoming dominant, which produces a sauce that is too dense and eventually breaks. The acid also provides the brightness that balances the garlic's sharpness. Use 45g of lemon juice for a milder, rounder flavour — the lemon's acid present as balance without being identifiable; or use up to 55g for a sharper, more assertively bright toum. As the emulsion builds and stabilises, you will see the toum becoming noticeably thicker, paler — whitening progressively from the initial pale yellow — and fluffier. The blades' continuous mechanical action incorporates air into the emulsion alongside the oil, producing the characteristic whipped, airy texture that is the visual hallmark of correctly made toum. Once the emulsion appears stable — thick, glossy, and maintaining its structure — the oil addition can be increased from drops to a thin, slow stream. Never increase to a pour; continue working gradually until all 320g of oil and all the lemon juice are fully incorporated.

The finished toum should have the texture of a thick, glossy spread — similar to mayonnaise but lighter, more aerated, and with more structure. It should hold its shape when a spoon is drawn through it and produce visible peaks when the blender or spatula is lifted. If the toum has become very thick during processing and the blades are struggling to maintain contact with the mixture, add 15–30g of ice-cold water — not room-temperature water, which can shock and break a fresh emulsion — in small increments while the blender runs. The ice water loosens the consistency without compromising the emulsion. Taste and adjust — additional lemon juice for more brightness, additional salt for flavour depth. Be conservative with adjustments; the flavour changes significantly after refrigeration and the freshly made toum will be considerably more pungent and sharp than the rested version.

If the toum splits — visible as the mixture separating into a pool of oily liquid with white garlic pieces floating through it rather than forming a cohesive cream — the situation is recoverable. Transfer the split mixture to a separate container. Add 1–2 tbsp of aquafaba (the liquid from a can of chickpeas — a natural emulsifier used in vegan preparations) or 1 egg white if not keeping the recipe vegan, to a clean processor or blending cup. With the machine running, slowly drizzle the split toum back into the aquafaba or egg white — treating it exactly as you would fresh oil in step 3, gradually building a new emulsion using the aquafaba or egg white's lecithin-like saponins as the stabilising agent. The split toum will re-emulsify within 2–3 minutes of careful addition.

Transfer the finished toum to a sealed container and refrigerate for a minimum of 2–4 hours before serving — overnight is better. Fresh toum is intensely, almost aggressively pungent — the garlic's alliinase enzyme reactions have just occurred and the allicin and other sharp volatile compounds are at their maximum concentration. During refrigeration, these volatile compounds partially dissipate and the emulsion's flavours integrate, producing the milder, more rounded, more balanced toum that is the correct final product. Toum served immediately from the processor is edible but noticeably sharper and harsher than properly rested toum.