Combine the oat groats with the water and salt in a small pot and bring to a boil. Reduce heat to low, cover, and cook for 30 minutes until most of the water is absorbed and oats are softened. Drain well and set the oats aside to cool to room temperature.
Meanwhile, toast the almonds in a 350 F oven for about 8 minutes until lightly toasted. Cool and chop.
In a small bowl, combine the minced garlic with the smoked paprika, the salt, the pepper, the Dijon mustard, the honey, and the vinegar. Mix well until honey is dissolved and the mixture looks uniform.
Slowly whisk in the oil until a smooth dressing forms.
In a large bowl, combine the cooked and cooled oat groats with the diced red onion, diced red bell pepper, the toasted chopped almonds, and the chopped dates. Mix the dressing again and pour it on the salad. Mix well. If you want to add the corn, mix it in now.
Add the arugula (or other salad green) and mix again. Serve immediately.
This salad keeps well in the fridge for 3 days, although the greens do wilt a bit.