Using a mortar and pestle, grind 4 slices jalepeno, 4 slices cucumber into 1/4 cup sugar. Pour mixture into a shaker. Add tequila, Cointreau and lime juice. Fill shaker with ice and shake heavily. Rub rim of 4 highball glasses with lime wedges and coat with salt. Fill with ice. Give the shaker one more shake and strain contents into each glass. Garnish with jalapeno and cucumber slices.