How to Make It
Combine water, milk, oats, and salt in a large saucepan; bring to a boil, stirring occasionally. Reduce heat; simmer, uncovered, until thickened, 5 to 7 minutes, stirring occasionally. Remove from heat and stir in syrup.
Meanwhile, combine 1/2 cup raspberries, 3/4 cup blueberries, and 3/4 cup strawberries in a medium microwave-safe bowl. Sprinkle with cornstarch and sugar; toss gently to combine. Microwave on HIGH until thick and bubbly, about 3 minutes. Remove from microwave; stir in lemon zest and remaining 1/2 cup raspberries, 1/4 cup blueberries, and 1/4 cup strawberries. Spoon compote over oatmeal; sprinkle with almonds.