  Higgs boson production in association with two tagging jets will be mediated
by electroweak vector boson fusion and by gluon fusion processes at the CERN
LHC. The characteristic distributions for the gluon fusion process are analyzed
for the $H\to W^+W^-$ signal at $m_H=160$ GeV, with subsequent leptonic decay
of the $W$-pair. The dominant backgrounds from top-quark pair production,
$WWjj$ production and vector boson fusion processes can be suppressed to a
level of $S/B\approx 1/4$, yielding a highly significant gluon fusion signal
with 30 fb$^{-1}$. Analysis of the azimuthal angle correlations of the two jets
provides for a direct measurement of the CP-nature of the $Htt$ Yukawa coupling
which is responsible for the effective $Hgg$ vertex.
