Avocado Chicken Caesar Salad

Tonight was an excellent summer feast, with veggie Russian sandwiches, sweet corn, and this salad, courtesy of Nigella Lawson, with a minor modification by me:

1 head romaine lettuce
1 egg yolk
3 tbsp. olive oil
Juice of 1/2 lemon
A few dashes Worcestershire sauce
3 tbsp. grated Parmesan (not the canned sort)
1 cold chicken breast, cubed or torn into bite-size pieces
2 avocados, cubed

Tear lettuce into large chunks & put in salad bowl. Whisk yolk. Slowly drizzle in oil while whisking. Whisk in lemon juice & Worcestershire sauce. Toss with lettuce. Sprinkle with Parmesan, then toss in chicken & avocado. Serves 2 generously.