Put the caviar in a soup plate. Pour boiling water over it and pour it out immediately, being careful not to lose any caviar particles. This is to wash out the impurities if any. Take out any spots if seen. Now add the bread, oil and lemon juice, a little at a time, mix well with a fork. You have to give this enough time to blend together smoothly until the caviar is much lighter in color. Use a spoon later for the mixing.