Jonah Ottensoser leans over the white stovetop to tweak its settings, giving me a full view of the black yarmulke on his head. But he's not about to bake a cake. Ottensoser, a large genial man with a gray beard, is an engineer, not a cook, and he's brought me to the kitchen in his Baltimore office to show off his proud creation: a stove that Jewish consumers will buy just to please God.

From sundown Friday to sundown Saturday, Orthodox Jews are forbidden to work, write, and drive. In all, 39 activities are off-limits to those complying with the Torah's fourth commandment, to keep the Sabbath holy. In the home, that means no cooking or fire lighting - or its modern analog, moving electricity through a circuit.

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