The Mott Haven Herald, a great community newspaper produced by CUNY students (launched by Riverdale Press Pulitzer Prize winner Buddy Stein, a retired Hunter College and CUNY Graduate School of Journalism professor) highlights great Mexican restaurants in Melrose, the community east of the Grand Concourse, north of East 149th Street. The only one I’ve been to is the excellent low-key Xochimilco Family Restaurant. Looking forward to trying out the others reported on here.
Bronx Matters 
Thanks for the plug!