Ingredients:

• 1/2 cup mayo
• 1/4 cup ketchup
• 3 cloves garlic very finely minced, or ground in a mortar and pestle
• 2 Tbsp relish
• 1 Tbsp white wine vinegar
• 1/2 tsp onion powder
• 1/2 tsp Worcestershire sauce
• 1/2 tsp salt

Steps:

1. Mix all ingredients together.

Notes:

All quantities are approximate. Adjust seasoning to taste, I didn't write it down well enough.

I used onion powder because I didn't have any previously chopped onion, and didn't want to cut a fresh one. 1/4 of an onion finely minced / ground in a mortar and pestle would probably be good, or maybe some caramelized onion.