Sugar-Free Vietnamese Coffee Condensed Milk

This is the syrup behind our Sugar-Free Vietnamese Iced Coffee. Real sugar-free sweetened condensed milk is hard to find on ordinary grocery shelves, so instead of chasing a specialty product, this version is homemade: whole milk, slowly reduced with allulose until it thickens into a pourable, condensed-milk-like syrup.

The Syrup

Combine 2 cups whole milk, 1 cup granulated allulose, and 1/4 tsp baking soda in a heavy-bottomed saucepan over low-medium heat. Bring it to a gentle simmer — not a boil — and let it reduce for 45-60 minutes, stirring occasionally at first and more often toward the end as it thickens. It’s ready when it coats the back of a spoon and looks like a thin, pourable condensed milk; it thickens further as it cools. Watch it closely in the last 10-15 minutes, since reduced milk can go from thin to scorched quickly once most of the water has cooked off.

Store the finished syrup in a sealed jar in the fridge for up to 1 week — shorter than the canned Standard version, since this is fresh reduced dairy rather than a shelf-stable canned product. It makes roughly 11 servings’ worth at 2 tbsp each.

This batch (11 servings)$4.20 total

Per 2 tbsp serving~$0.38

Assumptions: whole milk at Kirkland Signature Organic A2 pricing ($0.60/cup, this site’s default – see How Much You’ll Save Making Coffee at Home), allulose at typical grocery/bulk-bag pricing (~$3/cup, matching our Sugar-Free Caramel Syrup). Costs a bit more per serving than the canned Standard version, but the calorie difference is the real story here.

Storage & Shelf Life

• Keeps about 1 week in a sealed jar in the fridge – shorter than canned condensed milk, since nothing here is sterilized or shelf-stable.
• Give it a stir before using if it thickens unevenly in the fridge.
• Double the batch if you go through this quickly, but use a wide enough pan that the milk reduces evenly instead of scorching in a deep pool.

Swaps & Notes

• Why allulose? Same reason it shows up in our Sugar-Free Caramel Syrup – it behaves like real sugar when heated (helps the milk reduce and thicken properly) in a way most sugar-free sweeteners don’t.
• Why baking soda? A small pinch helps keep the milk proteins from browning or curdling too fast during the long simmer. It’s optional – the syrup works without it, just watch the heat a little more carefully.
• This genuinely cuts calories, not just sugar. Unlike some of this site’s “sugar-free” swaps, this one drops from 123 kcal/serving (canned condensed milk) to about 27 kcal/serving – because it’s diluted with real milk instead of being a concentrated syrup.

What to Make With This

2 tbsp of this, spooned into the bottom of a glass before hot coffee drips over it, is the Sugar-Free Vietnamese Iced Coffee. If sugar isn’t your main concern, the Standard version is just canned condensed milk, no cooking required. If you want real dairy and real maple instead of a sugar-free sweetener, see the Clean-Ingredient version.

Recipe Card Summary

Sugar-Free Vietnamese Coffee Condensed Milk

• 2 cups whole milk, reduced with 1 cup allulose and a pinch of baking soda
• Makes ~11 servings (2 tbsp each) · Prep: 5 min · Total: ~60 min (mostly hands-off simmering)
• Cost: ~$4.20/batch, ~$0.38/serving

FAQ

Can I use a sugar-free condensed milk product instead of making this?

If you can find one reliably and affordably, sure – but sugar-free sweetened condensed milk isn’t a common shelf item at most grocery stores, which is exactly why this recipe exists as a homemade stand-in.

Why does this take an hour when the Standard version takes two minutes?

Because it’s an actual recipe – real milk reduced on the stovetop – instead of a canned product you’re just portioning out. Most of that hour is hands-off simmering, not active work.

Is this really lower in calories, or just lower in sugar?

Both. Because it’s diluted with real milk rather than being a concentrated sugar syrup, it comes in at about 27 calories per serving versus the canned Standard version’s 123.