Chicken and Avocado Tacos

Yield: 1 Servings
1oz30 g ripe avocado.
2tbLow fat natural yogurt.
1tsLemon juice.
Salt and pepper.
Few lettuce leaves shredded
1Shallot or 3 spring onions
Trimmed and sliced.
1Tomato cut into wedges.
Quarter small green or red
Pepper finely chopped.
2Taco shells.
2oz60 g roast chicken sliced.