Take an empty jar such as an old jam, mustard or pickle jar. Preferably something with a wide enough top to fit a spoon. If you don't have an empty jar, buy a mason's jar at the grocery store. Place your minced shallot into the jar and cover with the white wine vinegar. Let sit for at least 5 minutes.
Wash and dry your lemon. Use a microplane to remove the zest, add it plus the juice from said lemon to your shallots (a handheld juicer is great for this).
Add your olive oil, salt and shake to combine. Taste and adjust accordingly.