2 oz. OYO Stone Fruit Vodka
0.5 oz. fresh-squeezed orange juice
0.5 oz. fresh-squeezed lemon juice
0.75–1 oz. simple syrup (to taste)
4–5 drops Angostura bitters (optional, but recommended)
Shake well with ice, then pour all ingredients into a short glass with fresh ice. Garnish with an orange slice.