Violet (Viola odorata), is used internally as a blood cleanser and lymphatic stimulant. It is taken as a tea or syrup. Violet can also be used as a tonic for chronically swollen lymph nodes. As with many other herbs with an action on the lymphatic system, it has a long tradition of use in the treatment of cancer. It is cooling, soothing and anti-inflammatory.
From Chestnut School of Herbal Medicine

For culinary use there are so many delightful ways to use violet syrup!
Drizzle over pancakes, waffles and French toast  

Serve with yogurt
Serve over a scoop of vanilla ice-cream
Add to cocktails, cordials and lemonade for lovely color, flavor, and health benefits. Adding a few drops of lemon juice to your drink will change the colour from blue to violet.
Stir into your favorite herbal tea
Combine with sparkling water

Colour changing wild violet Syrup