  Topological superconductivity can be engineered in semiconductors with strong
spin-orbit interaction coupled to a superconductor. Experimental advances in
this field have often been triggered by the development of new hybrid material
systems. Among these, two-dimensional electron gases (2DEGs) are of particular
interest due to their inherent design flexibility and scalability. Here we
discuss results on a 2D platform based on a ternary 2DEG (InSbAs) coupled to
in-situ grown Aluminum. The spin-orbit coupling in these 2DEGs can be tuned
with the As concentration, reaching values up to 400 meV$\unicode{xC5}$, thus
exceeding typical values measured in its binary constituents. In addition to a
large Land\'e g-factor $\sim$ 55 (comparable to InSb), we show that the clean
superconductor-semiconductor interface leads to a hard induced superconducting
gap. Using this new platform we demonstrate the basic operation of
phase-controllable Josephson junctions, superconducting islands and quasi-1D
systems, prototypical device geometries used to study Majorana zero modes.
