10 g (the amount I like. Please adjust to your taste.)
Salt and pepper
To taste, optional (I don't add any)
Drain the yogurt using the method of your choice. I use the method described in Recipe ID: 555666 by Cookpad user Kayonamama-san. 500 g of yogurt becomes 215 g of drained yogurt.
Mix the drained yogurt, mayonnaise, and salt and pepper to taste together, and it's done!
What's left over a week later. It hasn't become watery at all.
Story Behind this Recipe
I don't like mayonnaise, and couldn't eat it at all until about 3 years ago. So I tried alternate versions that I could eat, and came to this recipe. I couldn't even eat potato salad or kabocha squash salad before, so I used to mix mayonnaise with yogurt. You can make this in large amounts to keep in stock, as I describe in Steps 3 and 4.
Please drain the yogurt well. If you use the method described in Step 1, it's hard to mess up.