Happy New Year’s Eve, friends! I’m sliding in with one last cocktail for the year, and this one feels especially fun for a celebration. If you love a drink that is bright, bubbly, and just a little unexpected, this grapefruit rosemary gin-mosa checks all the boxes.

Grapefruit has always been one of my favorite citrus fruits, second only to blood oranges. I love its tart bite and how it brings a little extra personality to cocktails. It has that balance of fresh and slightly bitter that keeps a drink from tasting flat or too sweet, which is exactly why it works so well here.

I had recently made a batch of rosemary simple syrup to play around with, and once I paired it with grapefruit juice, I knew I was onto something. The rosemary gives the drink a subtle herbal note that feels cozy and a little fancy without making the recipe complicated. Add gin and a splash of prosecco or champagne, and suddenly you have a cocktail that feels right at home at brunch, a holiday gathering, or a casual toast at the end of a long week.

This is the kind of drink that looks beautiful in the glass, tastes fresh and festive, and comes together without much effort. Honestly, that is my favorite kind of cocktail.

What is Grapefruit Rosemary Gin-mosa?

A grapefruit rosemary gin-mosa is a sparkling cocktail made with fresh grapefruit juice, rosemary simple syrup, gin, and champagne or prosecco. It takes inspiration from a classic mimosa but adds a more layered, grown-up flavor thanks to the tart citrus, botanical gin, and soft herbal note from the rosemary.

Unlike a standard orange juice mimosa, this version leans a little more vibrant and a little more complex. Grapefruit brings brightness and a pleasant tang, while the rosemary syrup rounds everything out with just enough sweetness and an aromatic finish. The bubbles on top make it feel festive, which is probably why this is such a good choice for brunches, parties, and holiday celebrations.

It is elegant enough to serve for guests, but easy enough to make just because you want something pretty in your glass. That is always a win in my book.

Why You’ll Love this Recipe

• Fresh and vibrant: Grapefruit juice gives this cocktail a bright, citrusy flavor that feels crisp and refreshing.
• Lightly herbal: The rosemary syrup adds a soft, fragrant note that makes the drink feel a little more special.
• Simple but pretty: It looks polished and party-ready without requiring a long list of ingredients.
• Great for celebrations: The champagne or prosecco makes it perfect for brunch, holidays, showers, or New Year’s Eve.
• Easy to customize: You can use your favorite bubbly and adjust the sweetness slightly depending on your grapefruit.
• Balanced flavor: The tart grapefruit, gentle sweetness, botanical gin, and bubbles all work together beautifully.

Ingredients

• Fresh Grapefruit Juice: This is the star of the cocktail and gives it that fresh, tangy citrus flavor.
• Rosemary Syrup: Adds sweetness along with a subtle herbal flavor that pairs so well with grapefruit and gin.
• Gin: Brings a botanical backbone that keeps the drink crisp and interesting.
• Champagne or Prosecco: Topped on at the end for bubbles, sparkle, and that festive mimosa feel.
• Grapefruit Slices: A simple garnish that makes the drink look extra inviting.
• Fresh Rosemary: Adds a pretty finish and hints at the herbal flavor inside the glass.

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Substitutions & Additions

If you prefer a slightly softer cocktail, prosecco is a great choice because it usually has a gentler, fruitier finish than champagne. If you like a drier drink, champagne works beautifully and keeps everything crisp.

Fresh grapefruit juice is absolutely worth using here if you can. Since the cocktail has so few ingredients, that bright citrus flavor really matters. Bottled grapefruit juice can work in a pinch, but the drink will taste freshest with juice squeezed right before mixing.

For the rosemary syrup, you can let the sprigs steep a little longer if you want a more noticeable herbal flavor, but keep it subtle. Rosemary can become overpowering if it takes over the glass.

If you want to dress the drink up even more for a party, serve it in a large wine glass or champagne flute and add both a grapefruit wheel and a fresh rosemary sprig. It is a simple garnish, but it makes the cocktail feel extra polished.

How to Make this Recipe

Start by making the rosemary syrup. Add the water and sugar to a small saucepan and stir them together. Heat the mixture over medium heat until the sugar fully dissolves. Once it is smooth and clear, remove the saucepan from the heat and add the rosemary sprigs.

Cover the pan and let the rosemary steep for 10 to 15 minutes. This gives the syrup that gentle herbal flavor without making it too strong. After steeping, remove the rosemary and let the syrup cool completely. By the time it sits for a bit, it should already be well on its way, but you can also chill it in the refrigerator if you want to speed things up.

Once the syrup is cool, you are ready to build the cocktail. Fill a large wine glass or champagne glass with ice, then pour in the grapefruit juice, rosemary syrup, and gin. Stir gently to combine everything before topping it off with champagne or prosecco.

Finish the drink with a grapefruit slice and a sprig of fresh rosemary for garnish. Then serve it right away while it is cold, bubbly, and at its best.

Cooking Tips & Tricks

Use freshly squeezed grapefruit juice when possible. It gives the cocktail a brighter, cleaner flavor that really makes a difference in a recipe this simple.

Do not skip cooling the syrup before mixing the drink. Warm syrup can water down the ice quickly and make the cocktail lose some of its crisp finish.

When you are steeping the rosemary, start with the suggested time and taste after cooling if needed. You want that herbal note to support the grapefruit, not compete with it.

If you are serving these for a group, make the syrup ahead of time so assembling each drink goes quickly. That way all you have to do is pour, stir, top with bubbles, and garnish.

Choose a gin you already enjoy drinking. Since the pour is small but noticeable, a gin with clean botanical flavor works best here.

Serving Suggestions

This grapefruit rosemary gin-mosa is best served ice cold in a large wine glass, champagne glass, or flute. If you want it to feel extra festive, go with glassware that shows off the pale pink color and bubbly top.

For garnish, a grapefruit wheel and fresh rosemary sprig are all you need. They make the drink look polished without feeling fussy.

This cocktail is especially nice for brunch spreads, baby or bridal showers, holiday mornings, or a New Year’s Eve toast. It also works well for a relaxed happy hour when you want something that feels a little lighter and brighter than a heavy winter cocktail.

Storage Suggestions

The finished cocktail is best enjoyed right after making it. Once the champagne or prosecco is added, the bubbles will gradually fade, so it is not something you really want to store for later.

The rosemary syrup, however, can be made ahead and kept in an airtight container in the refrigerator for up to 1 month. Having it ready to go makes this cocktail even easier to mix whenever the mood strikes.

If you are planning for guests, you can also juice the grapefruit ahead of time and refrigerate it until serving. Then just assemble each drink right before serving for the freshest flavor and best sparkle.

Recipe FAQ

Can I use prosecco instead of champagne? Yes, absolutely. Either one works well here, so use whichever bubbly you prefer.

Can I make the rosemary syrup ahead of time? Yes. The syrup can be stored in the refrigerator for up to 1 month.

What kind of gin works best in this recipe? A clean, botanical gin works really well because it complements the grapefruit and rosemary without overpowering them.

Can I make this cocktail less sweet? Yes. Since grapefruit has a tart edge already, keeping the rosemary syrup to the listed amount gives a nicely balanced drink.

Is this good for brunch or only for parties? Both. It feels festive enough for a celebration but easy enough for a casual brunch cocktail too.

If you are looking for a cocktail that feels bright, bubbly, and a little more interesting than a classic mimosa, this grapefruit rosemary gin-mosa is such a fun one to make. The fresh grapefruit juice keeps it crisp, the rosemary syrup adds a subtle herbal twist, and the champagne or prosecco gives it that celebratory finish.

It is simple, beautiful, and perfect for everything from brunch to holiday gatherings to a last cocktail of the year. Pour a glass, add a pretty garnish, and cheers to something fresh and festive.