Lemon and orange extract can both be made quite easily in your kitchen. It uses the concept of extraction to preserve and concentrate that flavour!
How to Make Homemade Extracts: Easy Vanilla Extract Recipe & More
Homemade Orange Extract - Simply Stacie
Elevate Your Culinary Creations: A Guide to Making Citrus Extracts
How to Make Lemon Extract - Creative Simple Living
How to Extract Oil from Fruit Peels: 2 Best Ways
Homemade Lemon Extract - Sprinkle Bakes
How to Make Lemon Extract for Baking (So Easy!)
How to Substitute Lemon Extract for Lemon Zest
How to Substitute Lemon Extract for Lemon Zest
How to Make Orange Extract - Simple Living. Creative Learning
How To Make Homemade Orange Extract: A Zesty Delight - The Coconut
What Is Extraction? - the Theory and How It's Applied to Food - FoodCrumbles
Homemade Citrus Extracts - Spoonful of Flavor