Have you ever wondered what goes into making your favourite Starbucks coffee order?

Well, those perfectly married flavours don't discover themselves, and last week we were whisked away to Starbucks HQ to find out about a mysterious new drinks launch from the brand - coffee and olive oil.

In a security-guarded building in West London, behind an unassuming door plastered with "no entry" signs, myself and one other journalist were ushered into the world of the Oleato.

The brand-new line of coffee drinks from Starbucks combines two very unexpected ingredients, coffee and olive oil, to create a velvety smooth, luscious coffee that's unlike any other coffee I've tasted in both flavour and texture.

The olive oil in question is a cold pressed extra virgin olive oil - the high-quality sort you'd drizzle on salad or dip your favourite bread into - made from Nocarella del Belice olives in Sicily by Partanna. Now, you might be thinking - surely not with coffee? But yes, Starbucks have combined Partanna olive oil with their Starbucks arabica coffee to create their new range of drinks. But why? Well, the flavour brains at Starbucks think this particular olive oil pairs just perfectly with their coffee.

“One thing that’s special about Partanna’s olives is their uniquely nutty, slightly sweet flavours – think of that rich smoothness of a buttery caramel, it’s a natural complement to our coffee,” says Amy Dilger, principal beverage developer for Starbucks.

Inspired by a morning olive oil drinking ritual on olive oil farms in Italy, the olive oil is mixed into the drinks in a few different ways: either steamed into milk for an extra silky milky coffee, shaken into espresso for a savoury-sweet flavour that's super unique, or blended into cream for an indulgent creamy hit.

There are three new drinks in the range that'll be served worldwide, and we were one of the very first to try them, so naturally we're reporting our findings. You're very welcome.

The first drink we tried from the new range was the Oleato Iced Shaken Espresso. If you're an iced coffee fiend, this one's for you. On first sip, you'll get a rich, nutty espresso hit, made all the more nutty and smooth by the shaken-in cold pressed olive oil and oat milk. The texture is more creamy than your usual iced latte, and the savoury hit of the olive oil with the sweetness of the oat milk and coffee is unusual but keeps you going back for more - sort of like an olive oil ice cream or olive oil chocolate brownie.

Next, the product development team at Starbucks HQ whipped up an Oleato Golden Foam Cold Brew. We're talking basically a delicious cold brew, topped with a Partanna extra virgin olive oil infused cream cold foam. The first taste is super rich, so this is definitely one for those looking for an afternoon pick-me-up. As the creamy, rich olive-oil infused topping starts to seep through to the cold brew, you'll get serious iced coffee vibes.

And finally - the Oleato Caffe Latte. If you're feeling a little nervous about trying the new combo, this hot coffee version is for you. Made with the Starbucks Blonde Espresso Roast with a little sweetness to counteract the savoury taste of the oat milk and that famous Partanna olive oil, this one is super smooth and ultra comforting.

The coffee is being unveiled at the Starbucks Reserve Roastery in Milan, and will first appear in Starbucks Italy stores. After the seal of approval from Italians (who else) the Oleato will then launch in Southern California in the US in the spring, and will come to the UK later this year!