Considering all the work that goes into making the meal, you should give each dish its photographic due. For Martha Stewart-style photos, you'll need a high-speed macro or portrait lens. An f/1.8 between 50mm and 105mm is perfect. Get low, at the level of the dish, and shoot at the widest aperture. The shallow depth of field provides a dreamy look that has the yams fading off into softness. If it's a rectangular dish, put a corner in the center of the foreground; this way, the dish spreads out and has more depth. Use a background or tablecloth that contrasts with the food. Mixed light (window light on the food and incandescent in the background) adds warmth, if you keep WB on Daylight.