To a cocktail shaker add in your agave, jalapeño slices, and lime juice.
Muddle until fully combined and mushed together, don’t be scared to put some elbow grease into this, you know what I mean?
Add in Cointreau and tequila, then add ice and shake.
Double strain into a glass with a fresh cube. Or, do a dirty dump: aka dumping your shaker tin right into the glass, shaken ice and all.
Garnish with a jalapeño slice and lime wheel.