Gravy
Gravy is thick liquid often made from the juices of meats that become available during cooking, and are thickened with some kind of flour for added texture.
Sauce
Sauces are thick or thin liquids served on, or used in the preparation of foods and are not normally eaten by themselves. A well crafted sauce brings a dish together, adds just the right flavor, moisture, or visual appeal.
French Beschamal Sauce a classic, basic thick white sauce
French Espagnole a classic but basic brown sauce
French Hollandaise Sauce
Italian Pomodoro Sauce a basic red tomato sauce
Orange-Cranberry Sauce a holiday dinner tradition
Pesto (all variations listed below are at this link)
A basic pesto (Italy)
Arugula Walnut pesto
Bärlauchpesto pesto (German)
Chimichurri (Argetina + Uruguay)
Chive Pesto
Dandelion Styrian pesto (Austrian)
Kale Walnut Lemon pesto
Pesto Rosso (Italy)
Picada (Catalan)
Pistachio Arugula pesto
Pistou (France)
Roasted Pumpkin Seed pesto (Slovania)
Romesco sauce (Catalan red pesto)
Sorrel Pesto
Spinach pesto
Spiach Kale Basil pesto
Sweet Mint Pesto
Tarragon Walnut pesto
Thai Pesto
Zhoug pesto (Syria + Israel)