
Tomato juice is the unfermented liquid extracted from mature red tomatoes, strained free of peel and seeds but retaining finely divided flesh solids.
Savoury tomato aroma leads, over a low-sweet, moderately acidic body; commercial versions are often salted and acid-adjusted, which shifts the balance before anything else is added.
The bulk savoury base of pulpy juice drinks, added by the measure and rolled or gently shaken rather than hard-shaken to preserve its thick body. Its retained flesh solids settle on standing, so it must be re-mixed before pouring; its viscosity also leaves a cloudy residue rather than a clear pour.
Difficult to replace where the tomato character is the point: a substitute must supply both the savoury tomato aroma and the opaque pulpy body at once, which only another tomato product carries. Acidity and sweetness can be dialled in with added organic acid or sugar, but the tomato aroma itself cannot be built from an unrelated ingredient.
Tomato concentrates (puree, pulp, paste)
Tomato juice is a drink-ready liquid at roughly 5% tomato soluble solids; puree and pulp (≥8 to <24%) and paste (≥24%) are the same tomato liquid concentrated to far higher solids and are not drinkable without dilution.
Pressed from ripe tomatoes of red or reddish varieties, it is strained clear of skin, seeds and coarse matter while keeping the fine insoluble flesh solids that leave it opaque and pulpy. Under the US standard of identity it carries a tomato soluble solids content of at least 5.0 percent by weight; heat may be applied in extraction without adding water, and the juice may be homogenized, salted and acidified, or reconstituted from concentrate and labelled accordingly.
Perishable once opened; refrigerate and use within a few days, and re-mix before use as the solids separate.