Salade Tiède with Avocado, Bacon and Walnut Oil Dressing from Darina Allen's Simply Delicious Supper

Ingredients

• clarified butter or a mixture of butter and oil
• 4 tablespoons walnut oil or 2 tablespoons each walnut oil and sunflower or arachide oil mixed
• 1 large or 2 small avocados
• 170 g streaky bacon, in one piece, green or lightly smoked
• 1 teaspoon chopped chives
• 1 generous tablespoon white wine vinegar
• salt and freshly ground pepper
• 18 walnut halves
• 4 slices of white bread
• 1 teaspoon chopped parsley