Step 1

Whisk together all the ingredients for the dressing - olive oil, white wine vinegar, lemon, dill, salt and pepper- in the bottom of a large mixing bowl.

Step 2

Put all the ingredients for the salad - tomatoes, cucumber, red onion- on top of the dressing except for the avocado in a bowl and mix well.

Step 3

Carefully fold in the avocado.

Step 4

Garnish with more dill.  Serve immediately.