I always make a different sauce, depending on my mood and the flavors of the rest of the meal. Last night, a simple combination of 2% plain Greek yogurt and a little sweet pickle relish was just right. My burger sauces never include more than 3 ingredients, never take more than 45 seconds to make, and always include plain Greek yogurt.
As for the other items, I ran out of tomatoes, but soon our garden will be producing massive quantities with outstanding taste. Then I will be having tomatoes with everything! Happy grilling.