Texture: milling, blending, straining, and getting it into a bottle

Texture is the difference between a sauce people finish and one they use twice. It is decided by which tool you reach for, and the right tool is different for tomato and for chile.

Tomato: a food mill, not a blender

A tomato has two things you do not want in the sauce: skin and seeds. Tomato seeds are actively bitter when their coats are broken, and skin gives a papery grit no amount of cooking removes.

A blender pulverises both into the sauce. A mill separates them out mechanically — you turn a handle and skins and seeds stay in the hopper.

That is not just a quality argument, it is a time argument. With a mill you skip blanching, ice baths and peeling entirely: halve the tomatoes, cook them down, mill everything. That is roughly an hour removed from a 12-pound sauce day.

Disc choice:

• Coarse — rustic, visible texture, for a chunky marinara.
• Medium — the default for a Sunday gravy.
• Fine — smooth, for a passata or a pizza sauce.

Chile: a blender, and a long one

The opposite. For hot sauce you want the chile skin in there — it carries colour and a large share of the flavour — and the goal is to emulsify it so completely that it never settles out.

That takes a genuinely long blend. A full two minutes on high, not fifteen seconds. Under-blending is the single reason home hot sauce separates into two layers in the bottle.

• High-speed blender: emulsifies skin completely. No straining needed, no separation.
• Immersion blender: blends in the pot, which is safer with hot liquid and means fewer transfers — but it will not fully break chile skin. Strain afterward.
• Food processor: wrong tool. It chops; it does not emulsify.

Straining, and what it costs

Straining through fine mesh gives you a thin, clean, pourable Louisiana-style sauce that runs through a dripper insert. It also costs you 10–15% of your volume and some body.

Decide by destination:

Destination	Strain?
Woozy bottle with a dripper	Yes, hard. The insert clogs otherwise.
Squeeze bottle	Lightly
Jar, spooned	No — the body is the point
Canning	Follow the tested recipe exactly

Push it through with the back of a ladle. Waiting for gravity takes twenty minutes and gets you less.

Thickening — and the rule that is about safety

For a refrigerated sauce, xanthan gum at roughly 0.2% by weight gives a glossy, stable body with no starchy taste. Blend it in at the very end; sprinkle it into the vortex or it clumps instantly.

For anything you intend to can, no thickeners at all. Not xanthan, not cornstarch, not flour.

This is not a texture preference. Thickeners slow convection inside the jar, so heat reaches the centre far more slowly and the cold spot may never reach a lethal temperature within the tested process time. A tested process was validated on the un-thickened food. Thicken it and the process no longer applies. See the acid math.

The better approach is reduction: simmer longer and let water leave.

Non-reactive pans, always

Tomato and vinegar are acidic enough to strip bare cast iron and pull a metallic tang out of raw aluminium — and to pick up a grey cast from both.

Use enamelled cast iron or stainless steel. Nothing else, for anything acidic, ever.

Bottling

1. Sterilise the bottles. Ten minutes in boiling water, or a dishwasher sanitise cycle. A woozy bottle is not a canning jar and will not be processed, so this is your only kill step.
2. Fill hot, through a funnel, leaving about half an inch.
3. Dripper insert, then cap.
4. Label with the date. In March, three red bottles are indistinguishable.
5. Refrigerate anything that is not a tested shelf-stable process.

Woozy bottles hold 5 oz, which is the right size — a hot sauce you open should be finished while it is still good, not aged for a year in the door of the fridge.