Avocado Toast with Egg And Tomato

0 Toast the sourdough bread in a toaster until golden.
1 Cut the avocado in half, remove the pit and scoop out the flesh into a medium     bowl.
2 Season with salt and cracked pepper. Set aside.
3 Bring water to the boil in a small pot. Reduce heat to a gentle simmer, add the     vinegar.
4 Crack 1 egg into a small cup. Using a spoon, swirl the water in the pot to form a     whirlpool. Gently drop the egg into the center of the swirling water. Allow it to cook for 3-4 minutes without allowing the water to come to a boil.
5 As the eggs are poaching, divide and spread the mashed avocado between the 2 slices of toast. 
6 Using a slotted spoon gently lift the egg from the water and place on a sheet of     kitchen paper. Repeat with remaining egg.
7 Slice the cherry tomatoes in half and arrange on top of the mashed avocado. Top with poached eggs.
8 Serve topped with a sprinkling of fresh cracked pepper and a sprinkle of fresh chopped chives.