Interior designer and empty nester, Linda Engler and her husband Dave, are enjoying getting back to grown up dinners in the kitchen she designed herself. To that end, Mark Bittman and Chef Nick walk them through a Herb Seasoned Fish with a Tomato and Watermelon Salad, a recipe of Mark’s that perfectly fits their sophisticated tastes, and puts their new 36-inch range with griddle and Steam-Assist oven to good use.