1.   -- Make sure the broth is simmering before adding it to the rice.

2.   Check occasionally to be sure the broth is simmering steadily.

3.   Turn the heat down so that the broth just simmers.

4.   When broth is simmering, add clams in their shells, and tomatoes.

5.   With a fixed gaze, Madeleine Kamman watched the gently rolling chicken broth simmer around the endive on the stove.