  We prove that triangular configurations are plentiful in large subsets of
cartesian squares of finite quasirandom groups from classes having the
quasirandom ultraproduct property, for example the class of finite simple
groups. This is deduced from a strong double recurrence theorem for two
commuting measure-preserving actions of a minimally almost periodic (not
necessarily amenable or locally compact) group on a (not necessarily separable)
probability space.
