  The aim of this paper is to construct left-invariant Einstein
pseudo-Riemannian Sasaki metrics on solvable Lie groups.
  We consider the class of $\mathfrak z$-standard Sasaki solvable Lie algebras
of dimension $2n+3$, which are in one-to-one correspondence with
pseudo-K\"ahler nilpotent Lie algebras of dimension $2n$ endowed with a
compatible derivation, in a suitable sense. We characterize the pseudo-K\"ahler
structures and derivations giving rise to Sasaki-Einstein metrics.
  We classify $\mathfrak z$-standard Sasaki solvable Lie algebras of dimension
$\leq 7$ and those whose pseudo-K\"ahler reduction is an abelian Lie algebra.
  The Einstein metrics we obtain are standard, but not of pseudo-Iwasawa type.
