Two types of aperitif are kir and pastis. Kir is made with a mixture of white wine and creme of cassis which is a black currant liqueur. It is pure heaven. To spike it champagne is added and then it's called a kir royal.
Pastis is an aniseed flavored drink. It's served alongside a glass of water and you mix them together. Usually it's about a 1:5 ratio (one part pastis to 5 parts water). The mixture will look milky hence it's nickname 'the milk of Provence'. Due to aniseed it is licorice flavored.
So order up one of the above and savor it slowly. It leads to the upcoming meal which is eaten slowly and itself savored. No rush at all when you're dining in Paris.

