Dael Fry drew them level and Kieran Dowell completed the turnaround before the interval as England completed a hat-trick of Toulon successes courtesy of a 2-1 scoreline.
And fans will now be hoping it's a sign for success in Russian Federation this month as England go in search of a first World Cup since 1966.
Their prospects looked bleak in Martigues, however, when Mexico's Eduardo Aguirre, the tournament's top scorer with seven goals, broke free on the left to square for Alvarado to score with just over a minute on the clock.
England triumph for the third consecutive year in Toulon
The Young Lions were lucky that Uriel Antuna also failed to make telling contact when played through, the Manchester City youngster unable to double Mexico's lead with less than 12 minutes on the clock. Goalkeeper Freddie Woodman then saved Francisco Cordova's drive.
Fry was able to reedem himself but firing home from close-range after Mexico's goalkeeper completely missed a long throw which had been launched into the box.
Everton'sKieran Dowell put them ahead just before half-time after he was set-up by Arsenal forward Eddie Nketiah.
California-born Jonathan Gonzalez, who started Mexico's first four games at the Toulon Tournament, was sidelined with an injury suffered in Mexico's 3-1 semifinal final win over Turkey.
Thousands participate in gay pride parades across Europe
In Romania, attendees celebrated an European Union finding that all EU states must recognize the marriages of same-sex couples. Thousands, including members of a LGBT police association, also turned out for the 14th edition of Gay Pride in Athens.
Oil Prices Fall on Rising Global Production
That implies US crude output, already at a record high of 10.8 million barrels per day (bpd), will climb further. West Texas Intermediate (WTI) crude futures were down 21 cents, or 0.3 percent, at $65.52 a barrel.