Gastrique is basically a sweet and sour sauce that’s usually made with fruit. Gastrique is sometimes added to other sauces to give the tart element. Gastrique often is also used as a visual effect on a plate.
Fresh Squeezed juice from 1 red grapefruit
1 c. sugar
1 c. white vinegar
2 Tablespoons butter
pinch kosher salt
Melt butter in fry pan on medium heat and then add sugar and let it melt till it just starts to get color. You don’t want it to bubble too much so you might need to turn heat down a little.
Then add vinegar, stir and then add grapefruit juice and sir and lately add the saffron and salt.
Reduce the sauce slightly on medium low heat.
Grapefruit Saffron Gastrique