kiteasyStill Red

6-Gallon Red Blend (GSM-style Kit)

Red-blend kits — typically marketed as GSM-style, Bordeaux-style, or super-Tuscan-style — combine multiple grape concentrates for a more complex flavor than single-varietal kits. The Grenache-Syrah-Mourvèdre Rhône template is the most common, yielding spice, plum, and pepper notes. Plan a year from pitch to peak.

ABV12-14%
Ferment21d
Age120d
Total141d
Start in MakeMode

Ingredients

1 kit (16-18L)Red blend juice concentrate kit (GSM or Bordeaux blend)
6 LWater (top up)
5 gWine yeast (kit yeast or RP15)
1 packetOak chips (kit packet)
0.6 gPotassium metabisulfite
1 gPotassium sorbate

Equipment

  • 6-gallon primary
  • Glass carboy
  • Airlock
  • Hydrometer

Steps

  1. Day 0

    Mix must

    Pour kit into primary, top with water, pitch yeast.

  2. Day 0-7

    Primary

    Ferment at 70-75°F until SG below 1.020.

  3. Day 7

    Rack to carboy

    Siphon to glass carboy with oak chips packet.

  4. Day 7-21

    Secondary

    Ferment to dryness.

  5. Day 21

    Stabilize

    K-meta + sorbate; degas.

  6. Day 21-110

    Bulk age

    Bulk age 60-90 days. Blend kits benefit from longer aging than single-varietal kits.

  7. Day 120

    Bottle

    Bottle. Drink after 90+ days bottle rest. Improves over a year.

Related

Varietals: Grenache / Garnacha, Syrah / Shiraz, Mourvèdre / Monastrell

Tasting notes: plumblack-peppervioletvanilla-oak

About this 6-Gallon Red Blend (GSM-style Kit)

History

The Grenache-Syrah-Mourvedre blend is most closely associated with the southern Rhone Valley of France, particularly Chateauneuf-du-Pape, where the combination has been refined over centuries. The style gained international recognition in the mid-20th century as Australian winemakers adopted the blend, often reversing the proportions and coining the shorthand GSM. Home winemaking kits offering this blend became widely available in the 1990s as concentrate technology improved, allowing hobbyists to replicate the structure and flavor profile without access to fresh grapes. The blend's popularity in kit form reflects its forgiving nature and the complementary characteristics of the three varieties.

Technique

Kit-based GSM fermentation typically proceeds at 68-75 degrees Fahrenheit, with the concentrate providing pre-extracted color and tannin that eliminates the need for extended maceration. Primary fermentation usually completes within 7-10 days, followed by racking off the gross lees to a secondary vessel for clarification. Many winemakers add the oak chips during secondary fermentation or aging, allowing 2-4 weeks of contact before a final racking. Potassium metabisulfite is added at bottling to provide approximately 30-50 ppm free SO2, while potassium sorbate is included if any residual sugar remains to prevent refermentation in the bottle.

Ingredient notes

The concentrate blend ratio in most GSM kits favors Grenache for body and fruit, with Syrah contributing structure and Mourvedre adding earthy complexity, though exact proportions are rarely disclosed by manufacturers. The kit yeast or RP15 strain is selected for its ability to handle moderate alcohol levels and enhance red fruit character without excessive tannin extraction. Oak chips, typically American or French medium toast, provide vanilla and spice notes in a shorter timeframe than barrel aging. The 6-liter water top-up dilutes the concentrate to achieve proper sugar levels and final volume, while metabisulfite protects against oxidation and microbial spoilage throughout aging.

Variations

Traditional Chateauneuf-du-Pape blends may include up to thirteen permitted grape varieties, though GSM remains the core trio, with Grenache often comprising 60-80 percent of the blend. Australian GSM interpretations typically feature higher Shiraz proportions and riper fruit profiles due to warmer growing conditions. Some kit winemakers substitute Bordeaux-style blends featuring Cabernet Sauvignon, Merlot, and Cabernet Franc for a more structured, tannic profile. Adjusting oak chip contact time from two weeks to six weeks shifts the wine toward bolder vanilla and toast notes, while omitting oak entirely preserves brighter fruit expression.

Serving & pairings

GSM blends pair well with grilled meats, lamb tagine, ratatouille, and aged cheeses due to their medium-to-full body and balanced acidity. The wine is typically served at 60-65 degrees Fahrenheit in a standard Bordeaux or universal red wine glass to allow the fruit and spice aromatics to develop. The style suits casual dinners and outdoor gatherings, as its approachable fruit-forward character does not demand extensive contemplation. Many winemakers find that GSM kits benefit from 6-12 months of bottle age before serving, allowing the oak and fruit components to integrate fully.