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We present a simple permanent magnet set-up that can be used to measure theFaraday effect in gases, liquids and solids. By fitting the transmission curveas a function of polarizer angle (Malus' law) we average over fluctuations inthe laser intensity and can extract phase shifts as small as $\pm$ 50$\mu$rads. We have focused on measuring the Faraday effect in olive oil andfind a Verdet coefficient of $V$ = 192 $\pm$ 1 deg T$^{-1}$ m$^{-1}$ atapproximately 20 $^{\circ}$C for a wavelength of 659.2 nm. We show that theVerdet coefficient can be fit with a Drude-like dispersion law $A/(\lambda^2 -\lambda_0^2)$ with coefficients $A$ = 7.9 $\pm$ 0.2 $\times$ 10$^{7}$ degT$^{-1}$ m$^{-1}$ nm$^2$ and $\lambda_0$ = 142 $\pm$ 13 nm.

Measuring the Faraday effect in olive oil using permanent magnets and Malus' law