My son uses ketchup as if it were a sauce ...

Yogurt, cucumber, dill, lemon, garlic. Really nice with grilled meats or roasted veggies

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Tzatziki is a creamy, tangy Greek yogurt-based sauce or dip made with shredded cucumber, garlic, olive oil, and fresh herbs like dill or mint, often served as a meze (appetizer) with pita bread and vegetables, or as a topping for gyros, souvlaki, and grilled meats or fish. It's known for being cool, refreshing, and versatile, with a simple preparation that involves mixing strained yogurt with grated, squeezed cucumber, minced garlic, herbs, and a splash of lemon juice or vinegar.

Here's a recipe: https://www.themediterraneandish.com/wprm_print/tzatziki-sauce-recipe

And looking closer ranch is actually a dressing, not a sauce.

By itself? Absolutely disgusting.

As the base for a thousand other sauces and condiments? Absolutely vital.