Tempeh is usually purchased in a cake-like form and can be sliced or crumbled, and is often steamed, seared, or stir-fried. Look for tempeh that is covered with a thin whitish bloom.u003cbr/u003eu003cbr/u003eSometimes it has a few black or grayish spots, which is totally normal, but it should have no evidence of pink, yellow, or blue colouration – a sign that it has become overly fermented.