Preheat oven to 220 C (425 F). Line a rimmed baking sheet with parchment and set aside for a dry, hot surface that promotes crisping.
Place baby potatoes in a large saucepan and cover with cold water by 2 cm (about 1 inch). Add 5 g salt and bring to a gentle boil over medium-high heat.
Simmer for 8-10 minutes until just tender when pierced with a knife - you want a creamy interior without falling apart. Drain and let steam dry in the colander for 2 minutes to remove surface moisture.
Toss potatoes on the prepared sheet with olive oil, black pepper, and an additional pinch of salt. Arrange cut side down if halved so the exposed interior caramelizes and crisps.
Roast for 12-15 minutes, turning once halfway, until skins are blistered and golden brown and you can smell a toasty, nutty aroma from the pan.
In the last minute of roasting, sprinkle minced garlic over the potatoes and return to oven briefly to soften the raw edge without burning the garlic.
Remove from oven and immediately toss with lemon juice and parsley so the heat releases the aromatics and the lemon brightens the dish.
Serve hot, noting the contrast between the crackling skin and the pillowy, almost buttery interior. The aroma should be herb-forward with a background of roasted nuttiness.