Tacos de Canasta (Basket Tacos for a Party or Potluck) Recipe

Name: Tacos de Canasta (Basket Tacos for a Party or Potluck) Recipe
Total time: 100 min
Yield: 50
Ingredients: 50 corn tortillas, portioned into groups of 10, each wrapped well in foil; 2 medium white onions, thinly sliced (about 4 cups), divided; 3 medium cloves garlic; 6 dried guajillo chilies, stemmed, seeded, and torn into 1-inch pieces; 2 cups canola, vegetable, or other neutral oil, divided; Kosher salt; Fillings as desired (see note); Salsa verde or other salsas, for serving