Bio-Active Slow Cooker – 3 L

The slow cooker for the serious cook. Or the patient one.

The 3-litre Khurja Black Clay slow cooker for bone broth batches that last through the week, for the dum biryani that requires 8 hours, for mutton curry that needs three hours to become something extraordinary. Heavier walls than the 2L. Greater thermal mass. ICP-OES certified at parts-per-billion. Named Khurja artisan. 3-year structural warranty. Some cooking cannot be rushed — this vessel knows that.

Key Features & Benefits

• Greater Thermal Mass Than the 2L: Thicker walls at 3L volume mean the Khurja slow cooker holds temperature more consistently over long cooking periods. For 8+ hour bone broths, the temperature differential between cooking peak and 4-hour mark is smaller in the 3L than in the 2L.
• Family Dum Biryani: The 3L accommodates a full chicken dum biryani for 5–6 people: 600–700g raw basmati (at 50% pre-cook stage), the meat and gravy layer, and the finishing saffron rice. Room to spare for steam circulation.
• ICP-OES + Named Artisan + 3-Year Warranty: The full premium certification package at 3L.
• Slow Cooker Protocol Included: The Clay Care Passport includes specific 8-hour, 12-hour, and 16-hour cooking protocols for bone broth, slow curries, and dum preparations respectively.
• All Cooktops: Gas, induction (adapter disc included), wood fire.
• Zero Toxic Coating: Khurja black clay, fired and tested. No coating of any kind.

About the Material

At 3 litres, the Khurja slow cooker transitions from a personal or small-family vessel to a family centrepiece. The clay walls at this size are 8–9mm — the thickest in our range. This wall thickness creates the greatest thermal mass of any Klayvi cookware piece, which translates to the most stable cooking temperature and the longest heat retention. A 3L Khurja slow cooker at simmering temperature, turned off after a 6-hour bone broth session, will remain above 45°C for over an hour. This residual heat continues to extract collagen from bones long after the flame is off — which is why overnight dum cooking (bring to temperature, dum for 2 hours, turn off, leave overnight) produces results that cannot be replicated with a shorter active cooking time.

The Science

At 3 litres of volume in an 8–9mm clay vessel, the physics of thermal buffering become practically significant. Ambient temperature fluctuations (opening a window, turning on air conditioning) that would immediately affect the temperature of a thin metal vessel take 20–30 minutes to affect the internal cooking environment of the 3L Khurja. For bone broth where consistent temperature (82–88°C for optimal collagen hydrolysis without protein denaturation) is important, this buffering is the difference between a perfect broth and a cloudy, over-extracted

Safety & Certification Standards

Lab Test Results

Caring for Your Klayvi

What’s in the Box

• Bio-Active Slow Cooker 3L, Khurja Black Clay (pre-seasoned)
• Cast iron heat diffuser disc (large)
• Steel induction adapter disc (16cm)
• Named Khurja artisan card with photograph
• ICP-OES batch report card
• Batch QR card
• Clay Care Passport (8/12/16-hour protocols)
• 3-year warranty card

Frequently Asked Questions

Q: Can I leave the Khurja slow cooker unattended overnight?
On the lowest possible gas flame with the heat diffuser disc in place, yes — with precautions. The diffuser disc prevents base-centre overheating. Use a flame tamer or simmer ring if your gas hob cannot maintain a very low flame without going out. Check liquid level before sleeping. Never leave on maximum flame unattended.

Q: The dum biryani in the 3L is perfect for my family of 5. How do I scale the recipe?
3L Khurja: 600–700g raw basmati rice (soaked 30 min), 800g–1kg meat with marinade, 400ml water for gravy. Total fill: approximately 2.5L at raw stage, which reduces to 2L or so after cooking. The remaining 500ml headspace is important for steam circulation during dum.

Q: How do I clean the 3L Khurja after bone broth?
Let it cool completely — never add water to a hot 3L Khurja. Once cool: drain, rinse with warm water. The bone broth gelatin that forms on the interior scrubs off easily with a sisal scrubber and warm water. Never use soap on the unglazed interior. Sun-dry for 2–3 hours after cleaning to completely dry the thick 8–9mm walls.

Q: Does the 3L Khurja need different care than the standard terracotta handi?
The care is similar but with two differences: (1) Longer drying time after washing — the thicker walls hold moisture longer. Ensure 4–5 hours of drying before storage. (2) Monthly seasoning is more important — the Khurja clay’s different porosity means the seasoning layer builds differently. Apply the flaxseed oil protocol monthly without fail.

Q: Can I use the 3L Khurja slow cooker as a dahi (curd) setting pot?
Yes — the Khurja’s superior thermal mass makes it excellent for dahi setting. The unglazed interior of the Khurja (same as our dahi pots) allows the clay’s thermal buffering to maintain the 28–32°C ideal culture temperature for longer than standard terracotta. A very good secondary use for this vessel.

Q: What makes Khurja pottery “8,000 years old”? Is that a marketing claim?
It is an archaeological claim. Pottery with the mineralogical signature of Khurja-region clay has been found in excavations of the Copper Hoard Culture sites (circa 2000–1500 BCE) in the Gangetic plain. The continuous craft tradition of the Khurja cluster — where potters pass techniques from parent to child — is documented in historical texts from the Sultanate period (13th century CE) and likely extends much earlier. We say “8,000 years” conservatively.