Grapefruit St-Germain Martini

It’s Wednesday, which means its time for another Hump Day Happy Hour recipe! I discovered a new martini that I loved so much I couldn’t wait to share with you!  This Grapefruit St-Germain Martini is made with vodka, St-Germain Elderflower Liqueur, fresh squeezed red grapefruit juice and rosemary simple syrup.  It’s very refreshing and not too sweet!  Boy, I sure do feel like it’s been a while since I’ve posted a new cocktail recipe, does if feel that way to you too? This one’s a good one to jump back in the saddle with.

Grapefruit St-Germain Martini

My husband and I met up with some friends for dinner at the hot and trendy Washington DC restaurant, Le Diplomate, before I left on my European vacation.  While waiting for our table we had a cocktail at the bar. The bartender was so nice and shared with me how to make this delicious martini.  For the life of me I can’t remember what they named it so I’m just calling it a Grapefruit St-Germain Martini.  I suppose the name doesn’t really matter, all that matters is you be sure to try this at home!

I know St-Germain liqueur is a bit expensive but I really think you’ll enjoy this Grapefruit St.-Germain Martini. I bought a huge bottle of it and have barely used any of it so I’ll try to bring you more cocktails using it in the future.  In the meantime, you can also try a Nectarine Thyme-tini which is an awesome warm weather drink and has St-Germain in it as well.

Grapefruit St-Germain Martini
  • 1 shot vodka
  • ½ shot St-Germain liqueur
  • ½ shot rosemary simple syrup*
  • 1-2 shots red grapefruit juice, freshly squeezed (depending on your taste preferences)
  • Garnish: grapefruit slice or rosemary sprig
  1. Combine all ingredients in cocktail shaker filled with ice. Shake well and strain into chilled martini glass. Garnish with a slice of grapefruit or rosemary sprig.
  2. To make rosemary simple syrup, combine 1 cup sugar and 1 cup water in saucepan, bring to boil to dissolve sugar. Add a couple sprigs of fresh rosemary and let it steep till cooled. Remove rosemary. Store simple syrup in refrigerator. You can read more about making flavored simply syrups here
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    • Judy says

      Hope you enjoy it. I made it last night in a tall glass with club soda and ice. Also good! Does Liqueur go bad???

  1. says

    I love this martini! I am a huge fan of St Germain. And will usually order any cocktail on the menu made with this stuff.

    I also wanted to compliment you on your blog. You have such a natural style and it seems like I’m reading a letter from a friend. I appreciate that and it has inspired me to start a blog for my new venture as a wellness coach. You’re the best!

    • Judy says

      Thank you so much Marci! What a nice compliment! I will head over to your new site and check it out 🙂

    • Judy says

      Oh thank you! It was driving me nuts that I couldn’t remember the name, all I knew was it started with an R

  2. Dee says

    Loved this because I love Elderflower. You can get a much cheaper version of Elderflower Liquer than St Germaine. And I ran out of Rosemary simple syrup so added 1/2 shot more elderflower Liquer instead. Fresh squeezed grapefruit juice is important.

    • Judy says

      I agree…fresh squeezed grapefruit is the best! I’m not familiar with a less expensive version of St. Germaine, what’s it called?

  3. Greg Melcher says

    Here is the actual Romarin Recipe from the Diplomat:
    1 oz vodka (I recommend absolute citron or similar)
    1/2 oz elderflower liquor (st. Germain or other brands which are about 40% cheaper)
    1/2 oz grapefruit juice (I prefer white grapefruit juice)
    1/4 oz fresh squeezed lemon juice
    1/4 oz Rosemary simple syrup as described above

    Some will find this too sweet so just increase the amount of vodka and grapefruit juice until happy

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