Cold brew iced tea is one of the most keto-friendly beverages you can make. Plain cold brew has zero carbs, zero sugar, and zero calories — and its naturally smooth, mellow flavour means you need far less sweetener than hot-brewed tea. Add the right low-carb ingredients and you have a summer drink lineup that keeps you in ketosis without sacrificing flavour.

Here are six cold brew iced tea recipes, each under 2g net carbs per serving.

Why Cold Brew Is Ideal for Keto

Cold brew's slow, low-temperature extraction produces a naturally sweeter, less bitter tea than hot brewing. This matters for keto drinkers because:

• Less sweetener needed — the smooth flavour requires minimal correction
• No heat degradation of delicate compounds — you get the full antioxidant and L-theanine profile
• Batch-friendly — make a litre at a time and keep it in the fridge all week
• Fasting-compatible — plain cold brew tea has essentially zero calories, making it suitable for intermittent fasting windows

Keto Sweetener Guide

Sweetener	Net Carbs per tsp	Keto-Safe?	Notes
Monk fruit	0g	✅ Yes	Best flavour, no aftertaste
Erythritol	0g	✅ Yes	Slight cooling effect
Stevia	0g	✅ Yes	Use drops — powder may contain maltodextrin
Allulose	0g	✅ Yes	Behaves like sugar, excellent for syrups
Xylitol	4g	⚠️ Limit	Counts toward net carbs for some
Honey	6g	❌ No	Too high in carbs for strict keto

For all recipes below, we use monk fruit sweetener. Adjust quantity to your taste.

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Recipe 1: Classic Cold Brew Black Tea

Net carbs: 0g | Calories: 2 | Serves: 4

The foundation. Master this and everything else follows.

Ingredients

• 6 black tea bags (Assam or Ceylon)
• 1 litre cold filtered water
• Monk fruit sweetener to taste
• Ice and lemon slices to serve

Method

1. Place tea bags in a large jar or pitcher. Add cold water.
2. Cover and refrigerate for 10–12 hours (overnight is perfect).
3. Remove tea bags — do not squeeze them, as this can add bitterness.
4. Sweeten to taste with monk fruit sweetener.
5. Serve over ice with lemon.

Keto note: Zero net carbs. Suitable for fasting windows if consumed without sweetener.

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Recipe 2: Cold Brew Green Tea With Lemon and Ginger

Net carbs: 1g | Calories: 8 | Serves: 2

Green tea's L-theanine pairs with ginger's anti-inflammatory compounds for a genuinely functional drink.

Ingredients

• 4 green tea bags (Sencha or Dragonwell)
• 500ml cold water
• 3 slices fresh ginger (about 5mm thick)
• Juice of ½ lemon (adds ~1g net carbs)
• 1 tsp monk fruit sweetener
• Ice

Method

1. Combine tea bags, ginger, and cold water in a jar.
2. Refrigerate for 8–10 hours. Green tea cold brews faster than black — don't over-steep or it turns slightly bitter.
3. Remove tea bags and ginger. Stir in lemon juice and sweetener.
4. Serve over ice.

Why it works for keto: Lemon juice adds negligible carbs but dramatically brightens the flavour, reducing the need for sweetener.

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Recipe 3: Cold Brew Hibiscus and Mint

Net carbs: 1g | Calories: 5 | Serves: 4

Hibiscus cold brews into a stunning deep ruby colour with a naturally tart, cranberry-like flavour.

Ingredients

• 3 tbsp dried hibiscus calyces
• 8 fresh mint leaves
• 1 litre cold water
• 1–2 tsp monk fruit sweetener
• Ice and fresh mint to garnish

Method

1. Combine hibiscus, mint, and cold water in a pitcher.
2. Refrigerate for 12–16 hours. Hibiscus needs longer than tea bags to fully extract cold.
3. Strain through a fine mesh sieve.
4. Sweeten to taste. Serve over ice with fresh mint.

Keto note: Hibiscus is naturally very low in carbs — the tartness comes from organic acids, not sugars.

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Recipe 4: Cold Brew Oolong With Vanilla

Net carbs: 0g | Calories: 5 | Serves: 2

Oolong's natural stone-fruit and floral notes pair beautifully with vanilla — no sweetener needed.

Ingredients

• 3 oolong tea bags (or 2 tsp loose-leaf oolong)
• 500ml cold water
• ¼ tsp pure vanilla extract (not vanilla syrup — check for added sugar)
• Ice

Method

1. Steep oolong in cold water for 10–14 hours in the fridge.
2. Remove tea bags. Stir in vanilla extract.
3. Serve over ice — no sweetener needed if using a quality oolong.

Why oolong for keto: Oolong contains EGCG and other catechins associated with improved fat metabolism — a bonus for keto dieters.

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Recipe 5: Cold Brew Peppermint and Cucumber

Net carbs: 1g | Calories: 6 | Serves: 2

Cooling, hydrating, and genuinely refreshing — this is the ultimate hot-weather keto drink.

Ingredients

• 4 peppermint tea bags (or 2 tbsp loose dried peppermint)
• 500ml cold water
• 4 thin slices English cucumber
• Juice of ¼ lime
• Ice and cucumber ribbons to garnish

Method

1. Combine peppermint tea and cold water in a jar.
2. Add cucumber slices.
3. Refrigerate for 8–10 hours.
4. Strain, add lime juice, and serve over ice with cucumber ribbons.

Electrolyte tip: Add a pinch of pink Himalayan salt — it's tasteless at this concentration but helps with keto electrolyte balance.

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Recipe 6: Cold Brew Rooibos Chai

Net carbs: 1g | Calories: 10 | Serves: 4

Rooibos is naturally caffeine-free and has a naturally sweet, vanilla-like flavour that makes it the most keto-friendly base for a chai-style drink.

Ingredients

• 6 rooibos tea bags
• 1 litre cold water
• 1 cinnamon stick
• 4 cardamom pods, lightly crushed
• 3 whole cloves
• 2 slices fresh ginger
• 1 tsp monk fruit sweetener
• Splash of unsweetened almond milk (optional, adds ~0.5g net carbs)

Method

1. Combine all ingredients except sweetener and almond milk in a pitcher.
2. Refrigerate for 12–16 hours. The spices need time to infuse cold.
3. Strain through a fine mesh sieve.
4. Sweeten to taste. Serve over ice with a splash of almond milk if desired.

Why rooibos for keto: Zero caffeine, zero oxalates, naturally sweet flavour, and rich in antioxidants. It is one of the most keto-compatible tea bases available.

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Cold Brew Keto Tips

Batch brew on Sunday. Make 2–3 litres at the start of the week and keep them in the fridge. You'll have keto-friendly drinks ready every day without effort.

Use filtered water. Cold brew's subtle flavours are easily overwhelmed by chlorine or mineral-heavy tap water. A simple pitcher filter makes a noticeable difference.

Don't over-steep. Cold brew is forgiving, but leaving tea bags in for 24+ hours can produce bitterness even at cold temperatures. 8–16 hours is the sweet spot for most teas.

Add fat for a keto boost. A tablespoon of MCT oil blended into cold brew black tea creates a keto "bulletproof" iced tea with sustained energy. Use an immersion blender to emulsify — it won't mix by stirring alone.

Cold brew iced tea is one of the easiest wins on a ketogenic diet. Zero carbs, infinite variety, and genuinely delicious — your summer hydration is sorted.