  The ALICE measurement of K$^0_{\rm S}$ and $\rm\Lambda$ production at
mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV is
presented. The transverse momentum ($p_{\rm T}$) spectra are shown for several
collision centrality intervals and in the $p_{\rm T}$ range from 0.4 GeV/$c$
(0.6 GeV/$c$ for $\rm\Lambda$) to 12 GeV/$c$. The $p_{\rm T}$ dependence of the
$\rm \Lambda$/K$^0_{\rm S}$ ratios exhibits maxima in the vicinity of 3
GeV/$c$, and the positions of the maxima shift towards higher $p_{\rm T}$ with
increasing collision centrality. The magnitude of these maxima increases by
almost a factor of three between most peripheral and most central Pb-Pb
collisions. This baryon excess at intermediate $p_{\rm T}$ is not observed in
pp interactions at sqrt(s) = 0.9 TeV and at sqrt(s) = 7 TeV. Qualitatively, the
baryon enhancement in heavy-ion collisions is expected from radial flow.
However, the measured $p_{\rm T}$ spectra above 2 GeV/$c$ progressively
decouple from hydrodynamical-model calculations. For higher values of $p_{\rm
T}$, models that incorporate the influence of the medium on the fragmentation
and hadronization processes describe qualitatively the $p_{\rm T}$ dependence
of the $\rm\Lambda$/K$^0_{\rm S}$ ratio.
