Step #2 In a small bowl, mix the tomatillos, red onion, cilantro & 1/2 tsp of the hot sauce.
Step #3 In a medium bowl, mix the roast beef with the Fontina & the remaining 1/2 tsp of hot sauce.
Step #4 Arrange half of the tortilla chips on a large rimmed baking sheet.
Step #5 Spoon the roast beef filling onto the tortilla chips & top this with the remaining 24 chips.
Step #6 Bake the tostaditos for 5 to 7 mins, or until the filling is hot & bubbling.
Step #7 Transfer to a platter.
Step #8 Spice up the tomatillo relish with salt, spoon a little on top of each tostadito & serve as soon as possible.
Step #9 Wine Recommendation: Stuckey: The 1993 Iron Horse Brut Rosé from California is high in acidity, which refreshes the palate after a little south-of-the-border heat.
Step #10 Triffon: Sweet-tart-spicy Southwestern flavors love fruity Gewürztraminer, & the acidity & slight sweetness in the 1996 Domaine Weinbach Cuvée Laurence go nicely with the tomatillos.