01 - Preheat a grill or grill pan to medium-high heat and lightly oil the grates.
02 - Brush the plum halves with a little olive oil. Grill the plums, cut side down, for 2-3 minutes, or until grill marks appear and the fruit softens slightly. Remove and set aside to cool, then slice each half into wedges.
03 - Combine sliced almonds, oats, honey, olive oil, and a pinch of sea salt in a nonstick skillet over medium heat. Cook, stirring frequently, for 3-4 minutes until golden and fragrant. Spread on a plate to cool and crisp up.
04 - In a small bowl, whisk together olive oil, balsamic vinegar, Dijon mustard, salt, and pepper to make the dressing.
05 - In a large bowl, toss arugula and shallot with the dressing. Arrange on a serving platter or individual plates.
06 - Top with grilled plum slices, crumbled goat cheese, and sprinkle generously with the almond crumble. Serve immediately.