The sweet caramel and subtle char on the peaches gives this grill-time snack a pleasant smoky flavor.
Place sugar into a 1 quart pot. Slice oranges and lemon circles into quarters (pie shaped). Place the oranges and lemons in the pot with the sugar. Place the pot on a medium size flame (*can also be placed on the side-burner of a grill), and let mixture melt and turn to a light caramel color.
Add the orange juice and lager. Reduce the mixture to a syrup consistency, and then whisk in the diced butter in two batches. Remove the mixture from the flame when all of the butter is incorporated. Strain, if desired.
Cut the peaches into wedges (6 to 8 per peach), and toss them in bowl with the oil and salt.
Turn the grill on, and pre-heat for a half hour or until hot. Place the peach wedges on the grill cut side down for 2 minutes on each side, and then place them in heatproof bowl. Add the caramel and toss the peaches until they are glazed.