  We construct an entire solution $U:\mathbb{R}^2\to\mathbb{R}^2$ to the
elliptic system \[ \Delta U=\nabla_uW(U), \] where $W:\mathbb{R}^2\to
[0,\infty)$ is a `triple-well' potential. This solution is a local minimizer of
the associated energy \[ \int \frac{1}{2}|\nabla U|^2+W(U)\,dx \] in the sense
that $U$ minimizes the energy on any compact set among competitors agreeing
with $U$ outside that set. Furthermore, we show that along subsequences, the
`blowdowns' of $U$ given by $U_R(x):=U(Rx)$ approach a minimal triple junction
as $R\to\infty$. Previous results had assumed various levels of symmetry for
the potential and had not established local minimality, but here we make no
such symmetry assumptions.
