Cut Avocado in half and remove pit.  Slice the avocado halves while still inside the peel.  Use a spoon to remove avocado from peel in to a bowl.  Mash avocado with a fork until smooth.  Chop tomatoes and add to avocado.  Add lemon juice and spices and mix together.  This is the way I like to eat my dip, you can also add 1/4 cup red onion to the mix as well as add more or less of certain spices.  In the summer this recipe is very good with garden fresh cilantro and fresh lemons.