Step 1 Combine egg yolks, yogurt, lemon juice, sugar, Dijon mustard, salt and hot pepper sauce in top of double boiler. Cook over simmering water, whisking constantly, until mixture is slightly thickened and foamy, 10 to 12 minutes.
Step 2 Makes 1 cup (250 mL).
Thank you for your comment.
You can actually add the yogurt at step 1 with the egg yolks, lemon juice, sugar, Dijon mustard and salt and pepper.
When do you add the yogurt?